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Corrects speedometer readings after installing non-stock tire sizes or changing rear gear ratios Correct speedometer for accurate readings as required by law for tire sizes up to 54 Large 4.3 full color screen with user-friendly navigation for simple installation/feature changes Easy to view color screen even in direct sunlight Read/display/clear diagnostic trouble codes If youve installed 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 the Max Energy Spectrum allows you to re-program for correct speedometer readings as well as correct part-throttle shifting. The vehicles computer calculates your vehicles speed based on the diameter of the stock tires. If youve installed taller or shorter tires or changed the rear gear ratio the vehicles computer doesnt know how fast your vehicle is going. As a result the automatic transmission may not shift correctly and the speedometer readings will not be accurate as required by law.