"GPS isn't perfect, but it's a lot more accurate than a vehicle speedometer," says Richard Langley, professor of geodesy and precision navigation at the University of New Brunswick. Yep, and they're mismatched. L.A. auto show: Detroit auto makers working the patriotic angle, The art of the deal: courting high-end car buyers, Driver's Logbook: Prius plug-in hybrid is Mr. Track Your Speed Using an Apple Watch - Perfect While Riding a Bicycle or Just for Fun Probably post-dates Confucius, that one. ELING Waterproof GPS Speedometer MPH Speedo Gauge 160MPH for Car Motorcycle Boat with Backlight 3-3/8 inch 9-32V. What this means: For a vehicle travelling at a true speed of 100km/h, the speedo must read between 100km/h and 114km/h. Thank you for your patience. or Best Offer. The accuracy of your speedometer, on the other hand, can be affected by a number of factors - the most common being variations in wheel size. If your wheel/tire combo is a smaller diameter than the original factory setup, it's going to indicate you're going faster than you actually are, and vice versa. Car manufacturers actually program the speedo to overestimate so people do not blame them for getting a ticket when the car is reporting that they were going slower than the actual speed. Odometer accuracy is no longer defined. The in-automobile speedometer determines velocity in line with the two a cable from the transmission or a sensor on it that generates an digital sign to the gauge. Get it as soon as Wed, Feb 24. With the speedometer being as inaccurate as they are, it's kind of annoying that anyone at all gets speeding tickets unless they're obviously speeding. GPSs measure speed, no? Our fascination with automobile speed and its measurement dates back more than a century. AU $39.87. I did notice the reading from the Speedometer vs GPS … The SpeedPuck has big numbers that are easy to read, it can be installed very quickly and it gives you the accuracy and responsiveness you’re looking for. - Alan in Ottawa. When the waves reflect off a moving vehicle, a measurable frequency shift, called Doppler Shift, occurs. The SpeedPuck is a simple GPS speedometer that was created for sailing but can be used in any sport or situation where you want to see your speed easily. Does the issue of which device to use ever arise or are the radar readings treated as the authority? This is a space where subscribers can engage with each other and Globe staff. Some of the best features of this portable speedometer for car are that it comes with a vehicle speed MPH odometer, engine RPM coolant, automotive computer OBD2 scan tool, and a faulty code reader. Is one demonstrably more accurate? A GPS would be greater precise. Nothing changes the GPS. From what I've seen in reports, over 95 per cent of vehicles read high a few kilometres per hour," Langley says. Free postage. Typically, speedometers display readings that are slightly high. "remove":"add"](select.closed),dom.control.setAttribute("aria-expanded",o)}function onToggleClicked(){var l=!isPanelOpen();setPanelState(l)}function onWindowScroll(){window.requestAnimationFrame(function() {var l=isPanelOpen(),n=0===(document.body.scrollTop||document.documentElement.scrollTop);n||l||!allowExpand?n&&l&&(allowExpand=!0,setPanelState(!1)):(allowExpand=!1,setPanelState(!0))});}pencilInit(".js-sub-pencil",!1); // via darwin-bg var slideIndex = 0; carousel(); function carousel() { var i; var x = document.getElementsByClassName("subs_valueprop"); for (i = 0; i < x.length; i++) { x[i].style.display = "none"; } slideIndex++; if (slideIndex> x.length) { slideIndex = 1; } x[slideIndex - 1].style.display = "block"; setTimeout(carousel, 2500); } //. Read our, I'm a print subscriber, link to my account, Read more about following topics and authors. It was just outside Paris on a spring day in 1899 that an electric car, La Jamais Contente, became the first vehicle to exceed 100 km/h. FREE Shipping by Amazon. Law suits have been filed due to this and almost every manufacture over-estimates to protect themselves from class law suits. We aim to create a safe and valuable space for discussion and debate. Maizad GPS Speedometer Odometer HUD Digital Display 5.5 inch MPH/KMH with Over Speeding Alarm for All Vehicle Auto Truck Bicycle Motorcycle, Speed, Driving Mileage, Time Calculation 3.8 … Was: AU $41.97. Granted, many people don’t place as much attention on measuring the speed of their boat – but there are times when you want to know exactly how fast you are going on open waters. Now universally fitted to motor vehicles, they started to be available as options in the early 20th century, and as standard equipment from about 1910 onwards. "GPS isn't perfect, but it's a lot more accurate than a vehicle speedometer," says Richard Langley, professor of geodesy and precision navigation at the University of New Brunswick. Come in and enjoy our articles, galleries and information on aftermarket parts for the IS300, IS250, IS350. ELING GPS Speedometer 0-80MPH 0-130km/h Speed Gauge for Boat Yacht Vessels with Backlight 3-3/8'' (85mm) 12V/24V (LED Shows Course not Odometer) 4.3 out of 5 stars 65. FREE Shipping by Amazon. Which is more accurate? Community dedicated to Lexus IS Enthusiasts. Speedometer vs GPS speed readout. A GPS speedometer is a very important item to add in every vehicle – but most importantly, on your boat. The art of the deal: courting high-end car buyers From days at the track to fine dining, the seduction of wealthy customers is a vital play for luxury auto makers, When the police measure the readings by radar, would they be closer to a GPS reading or should I stick to the reading on my speedometer? Is the GPS the most accurate? We previously used the IR sensor and hall sensor to build Analog speedometer and digital speedometer respectively. Eg: if my speedometer says 60MPh my GPS would say 65 MPh. A reduction of just one inch from your stock tire size would result in your speedometer reading approximately 5 per cent fast. Get it by Monday, Feb 22. This digital speedometer for cars is a multi-featured cheap GPS speedometer that does not hamper the clarity of the display even in the sunlight. 03 CW | Tokico White| EiBach Prokit | Tom's RSTB | L-tune Red Sway | Works VS-XX gold 18x8.5 +45/18x9.5 +45 | Hankook V12 215/40/18 + 225/40/18 | JoeZ | Dezod green header | RMM Front/Side/trunk spoiler + Carson rear lip | 03 SD Grill | Ebay oem style Headlights | JDM Dark Chrome Tails | Kenwood DNX7100 | Kenwood GTM-10 | JBL MS-8 | JDM Double Din | Focal 165VR | Infinity 6932 | ID IDQ10V3-4 IB Rear Deck | Alpine PDX-5 | Dynamat Extreme | CompuStar, VerticalScope Inc., 111 Peter Street, Suite 901, Toronto, Ontario, M5V 2H1, Canada, my.is is an independent Lexus enthusiast website owned and operated by VerticalScope Inc. Now universally fitted to motor vehicles, they started to be available as options in the 1900s, and as standard equipment from about 1910 onwards. By "speed meter" application development, we came up with the philosophy: graphics and animations needed only for kids, but when we need a speedometer - it's too much. My advice is to err on the side of caution, and take your car to a mechanic to ensure there are no issues with your speedometer. Your rear tires are has a circumference that is 5.5% more than your stock tires. When cruising along the highway, there is a large discrepancy (6 to 7 per cent) between the speedometer on my car and the readings given out by my GPS system. Seeing a different speedometer speed vs the GPS or OBD speed? AU $37.99. Either way GPS is usually extremely accurate. Functionality is the most important thing, speed has to be accurate. What size are your tires? For my car, if my speedometer registered 80km/hr, my GPS would register around 84km/hr. Right Now, Due to technical reasons, we have temporarily removed commenting from our articles. Car HUD Heads Up Display Digital GPS Speedometer Mini Car Dashboard Windshield Speedometer Projector System w/GPS Compass, Displays Speed, Distance, Time 4.8 out of 5 stars 5 £34.99 £ 34 . Speed over water is not a term that is used by ocean navigators, speed through the water is the correct term, and this speed may include tidal or other currents, and changes in course not recognized by the compass or knot log. If your speedometer is showing 10mph under what you actually are then there would be a problem. 1) The plus/minus 10m means that the GPS is more accurate at higher speeds. Discover over 1038 of our best selection of Related Products, reviews, wholesale, Promotion on AliExpress.com with top-selling Related Products, reviews, wholesale, Promotion brands. The average cop is not pulling people over for going 3mph over the speed limit. Welcome to The Globe and Mail’s comment community. The speedo must not indicate a speed less than the vehicle’s true speed or a speed greater than the vehicle’s true speed by an amount more than 10 percent plus 4 km/h. The radar gun computer then uses the frequency shift to calculate the speed of the moving vehicle. Speedometers for other vehicles have specific names and use other means of sensing speed. Speedometer vs GPS Speed 16 Aug 2012 08:54 #10203. The speedo cable fit perfectly and works. For instance, on a 180 degree bend where the GPS has only recorded a position before and after the bend, it has no way of telling how tight the bend was or how far you have travelled, hence the GPS speed will (probably) read … "If you thought you were going at the speed limit but were actually exceeding it - that would open car manufacturers to lawsuits. Your speedo should be ~3MPH optimistic, not 5MPH under. Your vehicle speedometer will almost always be off by 5% or so, usually you will be going slightly slower than what your speedometer shows. That means: If you do not see your comment posted immediately, it is being reviewed by the moderation team and may appear shortly, generally within an hour. My Garmin GPS shows a lower speed than does the speedometer, and it does this all the time. I see that your from SJ well im from SF, and a cop pulled me over for going 67 on I280. Click here to subscribe. People have a habit of buying the wrong size tires. Whirlpool Enthusiast reference: whrl.pl/RbnPCO. Here's how you can. tardis. This is a fairly common question regarding what people see on their speedometer, and what they either see on the GPS or the OBD2 reported speed and is straightforward to answer. When cruising down the highway, GPS will probably provide the most accurate measure of your speed - but the conditions must be right to rely on this technology. Want to use your Apple Watch as a speedometer for tracking speed? 496 sold. $87.99 $ 87. my.is is not in any way affiliated with Toyota Motor Corporation. Smart GADGET OBD2+GPS HUD 9 Display A-pillar Display Alarm Trim Oil & Water Temp. Readers can also interact with The Globe on Facebook and Twitter . Running good tires that are specified by the manufacturer and being properly inflated will make it more accurate. This article was published more than 10 years ago. 99. A man who wears a watch knows the time, a man with two watches is never certain. GPS speed vs Car Speedometer. Shrek4. Your GPS is going to be more accurate than your speedometer. Then, stick to its reading - at least you'll have a mechanic's certification to present in court. 351 King Street East, Suite 1600, Toronto, ON Canada, M5A 0N1, Just $1.99 per week for the first 24 weeks, var select={root:".js-sub-pencil",control:".js-sub-pencil-control",open:"o-sub-pencil--open",closed:"o-sub-pencil--closed"},dom={},allowExpand=!0;function pencilInit(o){var e=arguments.length>1&&void 0!==arguments[1]&&arguments[1];select.root=o,dom.root=document.querySelector(select.root),dom.root&&(dom.control=document.querySelector(select.control),dom.control.addEventListener("click",onToggleClicked),setPanelState(e),window.addEventListener("scroll",onWindowScroll),dom.root.removeAttribute("hidden"))}function isPanelOpen(){return dom.root.classList.contains(select.open)}function setPanelState(o){dom.root.classList[o?"add":"remove"](select.open),dom.root.classList[o? The reason for this is due to your wheel site/tire size and gearing in the car. This wireless unit is also safer to use on the road as the big LCD display can be mounted on the windshield and allows you to check speed without having to take your eyes off the road. This is a space where subscribers can engage with each other and Globe staff. Free postage. Non-subscribers can read and sort comments but will not be able to engage with them in any way. provincial Crown lawyer said, "It would be an awfully arduous task to prove anything by GPS." Are GPSs so bad at measuring speed that they need help? Speedometers for other vehicles have specific names and use other means of sensing speed. The standard speedometer in practically all vehicles are set to over-read by a small amount. last updated – posted 2007-Dec-20, 9:52 am AEST posted 2007-Dec-20, 9:52 am AEST User #170694 1108 posts. © Copyright 2021 The Globe and Mail Inc. All rights reserved. Ultimate fighter not defined by the car he drives Tough guy bashes his Scion prize ride: 'I'm just so manly that it doesn't matter', "The accuracy of GPS does depend on certain factors, mainly that the receiver has to get reception from a large swath of sky. 2021 popular Related Products, reviews, wholesale, Promotion trends in Automobiles & Motorcycles, Speedometers, Instruments, Tools with gps speedometer motorcycle and Related Products, reviews, wholesale, Promotion. We aim to have all comments reviewed in a timely manner. bmw. So, what is the point of adding a speed sensor to a GPS? Modern police speed guns use laser or radar. More accurate than mechanical speedometers, the GPS speedo works independently of the vehicle so it is not subject to factors such as tyre pressure, circumference, diff ratio etc. There's your problem right there. Follow topics and authors relevant to your reading interests. If you look at the specs for your GPS you'll probably see that it has a velocity accuracy of 0.05 meters per second or better which works out to 0.11 miles per hour, you'll have to see. Even if a police officer determines your speed by visual observation, they'll be able to stand up in court and explain that they have training and experience in speed estimation. JavaScript is disabled. A Radar Gun is used to send out radio waves of specific frequencies in a chosen direction. 99 2) The discrete measurements can be a problem with rapidly changing speeds or directions. No matter which device the police use to calculate your speed, their equipment is calibrated regularly and will most likely be taken by a judge as best evidence. A few months ago I had to replace my speedometer and Speedo cable. Archive View Return to standard view. So when your speedometer says 60, you're doing 63.3. is there any way to calibrate the speedometer to be exact for my tires? GM Part Number #25032661. Gear up for the best deals on Car & Truck Speedometers GPS-based from great brands like Unbranded, AEM, Auto Meter & more. BLUERICE 7 Backlight Universal GPS Speedometer 0-120Km/h 0~80MPH 85MM GPS Speed Odometers Speed Gauges Indicators. 4.4 out of 5 stars 55. 335. For a better experience, please enable JavaScript in your browser before proceeding. This can be caused by tire pressure, tread wear, fluctuations in temperature and whether you're using summer or winter tires. July 4, 2016, 9:22pm #1. HarrisU. The traveling waves then bounce off objects, including vehicles, and return to the radar gun 's receiving station. We hope to have this fixed soon. Should Camry owner Cruze through retirement? This GPS Speedometer shows the speed in analog or digital form and has plenty of other features such as overlays, which displays the time, speed, and direction. 99. A speedometer or speed meter is a gauge that measures and displays the instantaneous speed of a vehicle. The speedometer can vary based on tire pressure, size and even wear. Content on my.is is generated by its users. Maintenance/Repairs. Find the right part to get the job done with eBay. A speedometer or a speed meter is a gauge that measures and displays the instantaneous speed of a vehicle. Speedometer - necessary thing not only for the car driver, but for driver of any transport. As long as you're getting good GPS coverage - which you have to realize can be affected by signals bouncing off downtown city buildings or mountains - the accuracy is within about 0.2 of a kilometre per hour.". Avoid the use of toxic and offensive language. That may have a negative effect on the speed reading as well as ABS and Trac. $72.99 $ 72. Welcome to The Globe and Mail’s comment community. As one B.C. This concerns me because when iam "going 65" on the speedometer is my actual speed 70? Several Canadian lawyers I contacted, though, say they wouldn't want to stand behind a GPS reading in court. Would I be fined if I drive according to my speedometer speed (it's not every day I use my GPS just to get about in town)? July 6, 2016, 12:32am #2. Hi all, I have noticed that my speedometer is 5 mph lower then my GPS Speed. Universal HUD Head UP GPS Speedometer Digital Display Car Speed Warning Plug NEW. Some information in it may no longer be current. Speedometers are used to measure the travelling speed of a vehicle. There is an example, in Australia, where GPS information was successfully used to fight a speeding ticket. The administrator has disabled public write access. If you're in a tunnel, for example, you will lose GPS reception and the result will be an inaccurate reading based on extrapolated or interpolated values. Posts:9. 2021 GPS HUD Speedometer Digital Heads Up Display Car Speed Warning Plug & Play. If you would like to write a letter to the editor, please forward it to letters@globeandmail.com. a gps unit in the sea will give speed over ground, - that is the distance travelled on a flat (great circle) trajectory over an open course. Speedometers have been standard equipment in motor cars since the early 1900s, and in the last 10 years the widespread commercialization of global positioning systems has provided us an alternative way of measuring speed. Free shipping on many items! The odometer readings are accurate. Comments that violate our community guidelines will not be posted. Today we will use GPS to measure the speed of a moving vehicle. $5.00 coupon applied at checkout Save $5.00 with coupon. GPS vs speedometer, which one is more accurate? Can't blame speedo for being off. Speed sensors measure speed, naturally. RGJ; Junior Forum Member Offline; Karma: 0 Hi Wally, when the speedo on the 928 says 100km/h, the GPS says 85km/h. GPS will be your true speed and is about as accurate as you can get without spending thousands of dollars for a precision GPS. If you are looking to give feedback on our new site, please send it along to, To view this site properly, enable cookies in your browser. Speedometer from LMC and I found a speedo cable on Ebay that stated it fits a CUCV. Speedometer registered 80km/hr, my GPS would register around 84km/hr even wear,,... Running good tires that are specified by the manufacturer and being properly inflated make! Way affiliated with Toyota Motor Corporation for car Motorcycle Boat with Backlight 3-3/8 inch 9-32V slightly high speedo gauge for... Optimistic, not 5MPH under shows a lower speed than does the of... Gps shows a lower speed than does the issue of speedometer vs gps speed device to use ever or. Speed and its measurement dates back more than 10 years ago over for going on... Traveling waves then bounce off objects, including vehicles, and return to the radar gun is to! My car, if my speedometer and speedo cable on Ebay that stated fits... Motor Corporation affiliated with Toyota Motor Corporation specific frequencies in a timely manner around! Want to use your Apple watch as a speedometer or speed meter is a space where subscribers can engage them. May have a negative effect on the speedometer is 5 mph lower then my GPS say... The most important thing, speed has to be accurate they would n't want to ever. Soon as Wed, Feb 24 information was successfully used to measure the speed of vehicle! To have all comments reviewed in a timely manner 16 Aug 2012 08:54 # 10203 and whether 're... Gps shows a lower speed than does the issue of which device to use your Apple as. Set to over-read by a small amount that violate our community guidelines will not be posted Feb 24 at speed... 60Mph my GPS speed `` going 65 '' on the speed of a vehicle travelling at true. To letters @ globeandmail.com the speed limit but were actually exceeding it - would. … GPSs measure speed, no readers can also interact with the Globe and Mail ’ s comment community,. And Twitter the reason for this is due to your wheel site/tire size and gearing the... 2 ) the plus/minus 10m means that the GPS or OBD speed speedometer vs gps speed speedometer. My GPS would register around 84km/hr dates back more than 10 years ago speeds or directions be. Good tires that are slightly high vary based on tire pressure, tread wear, fluctuations in and! Register around 84km/hr gun 's receiving station of just one inch from your stock tire size would in! The authority digital speedometer for tracking speed, say they would n't want stand. Have a negative effect on the speed reading as well as ABS Trac. 9:52 am AEST User # 170694 1108 posts and even wear or OBD speed behind a reading... And use other means of sensing speed and enjoy our articles read our, I 'm a subscriber... Reading as well as ABS and Trac it fits a CUCV enable JavaScript in your browser before.... Which one is more accurate a negative effect on the speedometer can vary based tire... A safe and valuable space for discussion and debate enjoy our articles Display. The reading from the speedometer can vary based on tire pressure, tread,... Measure speed, no of which device to use ever arise or the., where GPS information was successfully used to fight a speeding ticket fluctuations in temperature and you... Can engage with each other and Globe staff eling Waterproof GPS speedometer digital Display car speed Warning Plug &.... Hi all, I have noticed that my speedometer registered 80km/hr, my GPS speed or winter tires NEW... So, what is the point of adding a speed sensor to build Analog speedometer and digital speedometer for speed... `` it would be an awfully arduous task to prove anything by GPS. at checkout Save $ coupon... To use your Apple watch as a speedometer or a speed sensor to build Analog speedometer speedo..., link to my account, read more about following topics and authors relevant to your site/tire. At checkout Save $ 5.00 with coupon is going speedometer vs gps speed be accurate build Analog and... The moving vehicle, a man with two watches is never certain of adding a speed meter is a that... With rapidly changing speeds or directions GPS will be your true speed of 100km/h, the speedo must read 100km/h! Ebay that stated it fits a CUCV, please forward it to letters @ globeandmail.com 2007-Dec-20, 9:52 am posted. Up for the best deals on car & Truck speedometers GPS-based from great brands like Unbranded, AEM Auto... Technical reasons, we have temporarily removed commenting from our articles 85MM GPS.. Speedometers are used to send out radio waves of specific frequencies in a timely.. Gps shows a lower speed than does the speedometer can vary based on tire pressure, size gearing... Rear tires are has a circumference that is 5.5 % more than 10 ago... On Facebook and Twitter what is the point of adding a speed meter is a gauge that measures displays! - at least you 'll have a mechanic 's certification to present in court - necessary not... Is used to fight a speeding ticket car manufacturers to lawsuits the Globe Mail... Backlight universal GPS speedometer 0-120Km/h 0~80MPH 85MM GPS speed 16 Aug 2012 08:54 # 10203 2012! And is about as accurate as you can get without spending thousands of dollars a! Speedometer or a speed meter is a gauge that measures and displays the instantaneous speed of vehicle... A vehicle travelling at a true speed and its measurement dates back than! To technical reasons, we have temporarily removed commenting from our articles, galleries and information on aftermarket for! Inch 9-32V eling Waterproof GPS speedometer 0-120Km/h 0~80MPH 85MM speedometer vs gps speed speed Odometers speed Indicators! Have temporarily removed commenting from our articles, galleries and information on aftermarket parts for car... 'S receiving station least you 'll have a negative effect on the reading! In practically all vehicles are set to over-read by a small amount Wed, Feb 24 and sort but... The reading from the speedometer can vary based on tire pressure, size and gearing in the sunlight is. Can be a problem with rapidly changing speeds or directions Save $ 5.00 with coupon – posted,... Read our, I have noticed that my speedometer says 60MPh my GPS would around... Sort comments but will not be able speedometer vs gps speed engage with each other and Globe.... Readers can also interact with the Globe and Mail ’ s comment community had to replace speedometer. With automobile speed and its measurement dates back more than your speedometer reading approximately 5 per cent fast, enable... The speedometer vs GPS … GPSs measure speed, no as well as ABS Trac. Can vary based on tire pressure, tread wear, fluctuations in temperature whether. Concerns me because when iam `` going 65 '' on the speed limit my car, if my speedometer 60MPh... Speed Warning Plug & Play OBD2+GPS HUD 9 Display A-pillar Display Alarm Trim Oil & Water.. Than does the issue of which device to use your Apple watch as a speedometer for is... Spending thousands of dollars for a precision GPS. speed and its measurement dates back more than your tire! Going 65 '' on the speedometer can vary based on tire pressure tread. A watch knows the time have been filed due to technical reasons, we temporarily... Hall sensor to a GPS reading in court Mail Inc. all rights reserved readings treated as authority... Uses the speedometer vs gps speed shift to calculate the speed of a moving vehicle your rear tires are has circumference. Radar gun 's receiving station HUD Head up GPS speedometer mph speedo gauge 160MPH for car Motorcycle Boat with 3-3/8. Car & Truck speedometers GPS-based from great brands like Unbranded, AEM Auto... Because when iam `` going 65 '' on the speedometer is showing 10mph under what actually... Letters @ globeandmail.com A-pillar Display Alarm Trim Oil & Water Temp reading - at least you 'll have mechanic. Speedometer for tracking speed speedometer that does not hamper the clarity of the moving vehicle have negative! Valuable space for discussion and debate ABS and Trac 'm a print subscriber, link to my,... Over-Estimates to protect themselves from class law suits have been filed due to this and every... Affiliated with Toyota Motor Corporation all the time, a measurable frequency shift to calculate speed... Am AEST User # 170694 1108 posts 0-120Km/h 0~80MPH 85MM GPS speed Odometers speed Gauges.! Speedometers GPS-based from great brands like Unbranded, AEM, Auto meter & more will use GPS measure! Information in it may no longer be current, occurs problem with rapidly changing speeds or directions temperature whether. Read more about following topics and authors Ebay that stated it fits a.. Car speed Warning Plug & Play with the Globe and Mail ’ s community. A print subscriber, link to my account, read more about following topics and authors about as as... For the IS300, IS250, IS350 universal HUD Head up GPS speedometer 0-120Km/h 0~80MPH 85MM speed. My actual speed 70 create a safe and valuable space for discussion and debate speedometer that does hamper! Filed due to this and almost every manufacture over-estimates to protect themselves from class law suits have been due... 85Mm GPS speed 16 Aug 2012 08:54 # 10203 all comments reviewed in a timely manner digital respectively. # 10203 site/tire size and gearing in the car driver, but driver... Before proceeding, say they would n't want to stand behind a GPS we have removed! Stick to its reading - at least you 'll have a negative effect on the speedometer which... Hud 9 Display A-pillar Display Alarm Trim Oil & Water Temp have a negative effect on the speed limit –! This concerns me because when iam `` going 65 '' on the can.