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Changing tire and gear sizes can have an adverse effect on your speedometer and odometer readings. To correct this, all you need Hypertech Speedometer Calibrator programmer. Hypertech has assembled some of the best features from their series of programmers and tuners into one stand-alone unit. Engineered to recalibrate your speedometer and odometer by just plugging it into the OBDII port under your dash, just plug in, select your tire size and/or gear ratio and in a matter of minutes you will have accurate speedometer and odometer readings again with Hypertech Speedometer Calibrator programmer – it have the ability to read and clear Diagnostic Trouble Codes (DTCs) or "check engine" lights.
After installing tires that are larger or smaller than original equipment tires, or installing a ring and pinion gear set with a different rear gear ratio into your vehicle, the Speedometer Calibrator allows re-programming for correct speedometer and odometer readings, as well as correcting part-throttle shifting. As a result, the automatic transmission shift correctly and the speedometer readings will be accurate (as required by law).
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