Speedometer Calibration

Latest Speedometer Calibration Questions

2005 trailblazer 4.2 - speed sensor / speedometer problem
driving 30mph reads 50mph - what would cause that? not a digital dash, where do i start??... Read Answer
Asked by jerryh20 on Thu, 01/05/2012 - 08:36

where is the speedometer on a 1997 grand am
I am trying to locate the speedometer on a 1997 grand am ... Read Answer
Asked by pleclerc on Sun, 11/20/2011 - 16:19

Speedometer...
95 Mustang GT 5.0, i just fixed the tranny speed sensor but my speedometer is still not working...help? please!... Read Answer
Asked by man-with-a-stang on Sun, 11/06/2011 - 18:26

91 chevy 1500 speedometer
i replaced the speed sensor and the cluster the speedo still does not work . when i take the speedo out and put it an a identical truck then it works but not in my truck. what... Read Answer
Asked by topfueltina on Thu, 10/27/2011 - 20:38

1997 honda accord speedometer problem
1997 honda accord speedometer quit working when i got into my car after going to the store, once i came out headed home the speedometer quit working but the rpm is still worki... Read Answer
Asked by iancarick@att.net on Mon, 09/05/2011 - 18:03

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Information

What is a speedometer?

The speedometer is installed on the instrument panel of a vehicle and measures the speed in miles or kilometers per hour. While the speedometers of some older vehicles are mechanically driven, eddy current devices and electronic speedometers are the most common. Neither technique uses tire rotation to indicate speed. Rather, the speed indications are scaled to the rotation of the transmission, which may be subject to some error, and, from time to time, calibration may be necessary.

Is my speedometer accurate?

If not calibrated to an acceptable degree of accuracy, a driver may exceed or go below posted speed limits. Excessive error can be caused by putting on after market modifications, including tires with nonstandard diameters, using different differential gearing, or other specification modifications.

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