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My speedometer needle says it is going several mph faster than it really is according to the satellite fed digital speedometer on my GARMIN GPS.
Can these be calibrated or should I be going after a new cluster under warranty?
and unless it's level flat road, the gps could be off...
best way to test it, is on the interstate - set the cruise for 60 and time between nile markers - 60 = 1 mile per minute but test it over 4 or 5 miles...
good luck