Hypertech 730129 In-Line Speedometer Calibrator Module 20-23 GM 6.6L Duramax L5P CNC-424005 please see fitment note below

please see fitment note below

If you didn't fix the cover

installing the Carli Front Differential Guard will give your ring and pinion a solid steel shield should a direct-impact be encountered

Give your truck more pulling power and much improved throttle response with an MBRP inc

But then you add another set of lights

Hypertech 730129 In-Line Speedometer Calibrator Module 20-23 GM 6.6L Duramax L5P CNC-424005 please see fitment note belowGet accurate speedometer readouts and proper shifts with the Hypertech Speedometer Calibrator for your L5P Duramax. Hypertech's In Line Speedometer Calibrator Module is a plug and play module that corrects the speedometer and odometer for non stock and or gear ratios. With the included USB cable, connect the Hypertech In Line Speedometer Calibrator to your PC and enter the new tire size and or rear gear ratio. There are no limitations to tire height