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Corrects Speedometer / Odometer. If you have installed a set of tires that are larger or smaller than original equipment tires or if you have installed a ring and pinion gear set with a different rear gear ratio Rough Country’s Speedometer Calibrator allows you to correct your speedometer and odometer readings. The vehicle’s computer calculates your speed based on the diameter of the stock tires. If you’ve installed taller or shorter tires or changed the rear gear ratio the vehicle’s computer doesn’t know how fast your vehicle is actually going. As a result the speedometer/odometer readings will not be accurate. Diagnostics Tool. The Rough Country Speedometer Calibrator can also be used as a diagnostic code reader. Save yourself time and money by reading and clearing your own Diagnostic Trouble Codes DTCs rather than paying a dealer to do the same. It’s as easy as a few simple steps. Easy to Load; Easy to Restore. When you make changes to your vehicle the Speedometer Calibrator