A signal originates from a driven gear that meshes with the transmission tail shaft. An easy way to measure your speedometer accuracy it to run a road test. The check lengths can tell you how accurate your trip meter and odometer are, but not the speedo. You can just swap out the cluster, or the speedo mechanisms itself. I find it frustrating to have a gauge / instrument that is not accurate. Please let us know if you find an answer to the re-calibration issue. The color and a marking in it will identify the number of teeth. The 1998-2000 Rangers are not equipped with a VSS (Vehicle Speed Sensor). If that’s the case, changing gears is not going to help. If the odometer numbers measure accurately but the needle is not accurate for your speed, the problem is in the internal speedometer mechanism. I know, I’ve checked…. Replacing … So I am guessing the alarm is more accurate. 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. Then pull the cable from the transmission and look at the speedometer gear. For instance, on my 2012 Tiger 800XC the speedo is … If the odo is accurate but the speedo is wrong, then there is a mechanical problem with the speedo dial mechanism, it happens. We should not be dismissive when members of this discussion group level legitimate criticisms. Question type: Maintenance & Repair We have the factory 18s and our's is on the low side so at posted 70mph we are really doing 66 to 67mph. Gear Driven Speedometer Operation . 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. 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. "The accuracy of the speedometer in most vehicles, including Volkswagens, is generally within a few percentage points of actual speed," Tetzlaff … 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. I've also found my speedometer to be off by about 3 to 4mph at 70mph. 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. It’s purely mechanical. Its really totally unacceptable that my BMW's speedometer is far less accurate than my wife's Honda minivan or my 1998 Maxima. 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. John Freeways have mile markers that indicate the length of each mile you are traveling. 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