About the only way to get this checked is to take it to a speedo shop and have them test whether it is off or not. Unless your gear ratio has been changed in your car and I doubt that as you have to pull the trans to do it, then the sensor may be wrong. Speedos mostly are pretty accurate or maybe 5 mph off at the most.
Measure off a mile. Use a stopwatch and at 60 it should take 1 minute.
There are speedometer shops that can calibrate the gauge.
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Sunday, October 3rd, 2010 AT 12:47 PM