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The speedometer drive gear is your primary calibration means. Check your speedometer reading against a known accurate speedometer. If it reads too low, use a speedometer drive gear with fewer teeth. If it reads too high, use a speedometer drive gear with more teeth. Do this in one-tooth increments.
Instrument Panel Function & Electrical Basics

 The speedometer drive gear is your primary calibration means. Check your speedometer reading against a known accurate speedometer. If it reads too low, use a speedometer drive gear with fewer teeth. If it reads too high, use a speedometer drive gear with more teeth. Do this in one-tooth increments.  View Related Article

 

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