For instance, on my 2012 Tiger 800XC the speedo is … An easy way to measure your speedometer accuracy it to run a road test. If the odo is accurate but the speedo is wrong, then there is a mechanical problem with the speedo dial mechanism, it happens. You can just swap out the cluster, or the speedo mechanisms itself. If the alarm is set at 75 mph, when it goes off the speedometer is reading something like 79 mph. We should not be dismissive when members of this discussion group level legitimate criticisms. If that’s the case, changing gears is not going to help. We have the factory 18s and our's is on the low side so at posted 70mph we are really doing 66 to 67mph. For the sake of illustration, assume that a stock GTI, when equipped with the OEM tire—a Bridgestone Potenza S001—has a perfectly accurate speedometer. Speedometer not accurate. Electronic Speedometer (1995-Up): In 1995 the Ranger stopped using a mechanical speedometer cable and relied on the VSS in the transmission/transfer case to provide it with a signal for speed. The check lengths can tell you how accurate your trip meter and odometer are, but not the speedo. Replacing … But I have not done any tests or anything to verify and I have not tried the max MPH function on my E36 to compare. Gear Driven Speedometer Operation . I've also found my speedometer to be off by about 3 to 4mph at 70mph. While testing, you will not only be looking at mph, but you also need to look for a discrepancy between the odometer and the speedometer needle. Please let us know if you find an answer to the re-calibration issue. "The accuracy of the speedometer in most vehicles, including Volkswagens, is generally within a few percentage points of actual speed," Tetzlaff … Then pull the cable from the transmission and look at the speedometer gear. If the odometer is accurate (and the tests above show the rear gear and speedometer gear match) then it’s probably a lazy speedometer head. I know, I’ve checked…. I find it frustrating to have a gauge / instrument that is not accurate. Jump to Latest Follow 1 - 7 of 7 Posts. The safest and most accurate way to execute this test is to have a passenger in the car with a stopwatch. The color and a marking in it will identify the number of teeth. Whether you have a 1969 Chevrolet Nova Super Sport, a 50s era Oldsmobile Rocket Eighty-Eight, or even a British sports car like a Jaguar E-Type the speedometers basically work the same. GR So I am guessing the alarm is more accurate. If the odometer numbers measure accurately but the needle is not accurate for your speed, the problem is in the internal speedometer mechanism. John Question type: Maintenance & Repair A signal originates from a driven gear that meshes with the transmission tail shaft. Its really totally unacceptable that my BMW's speedometer is far less accurate than my wife's Honda minivan or my 1998 Maxima. Freeways have mile markers that indicate the length of each mile you are traveling. The 1998-2000 Rangers are not equipped with a VSS (Vehicle Speed Sensor). It’s purely mechanical. Asked by Dylan Jul 14, 2015 at 10:45 PM about the 1995 Chevrolet C/K 1500 Cheyenne Extended Cab 4WD. Reading something like 79 mph alarm is set at 75 mph, when it goes the! I am guessing the alarm is set at 75 mph, when it goes off the speedometer gear group! An answer to the re-calibration issue when members of this discussion group level legitimate.... Accurate than my wife 's Honda minivan or my 1998 Maxima the cable from the transmission tail shaft is accurate... 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