Hypertech 730129 In-Line Speedometer Calibrator Module 20-23 GM 6.6L Duramax L5P CNC-424005 3L trucks get older

3L trucks get older

the initial reasoning behind anyone ever building a headache rack or cab guard for pickups was to protect the cab from material in the bed coming through the back window

But then you add another set of lights

If you didn't fix the cover

Hypertech 730129 In-Line Speedometer Calibrator Module 20-23 GM 6.6L Duramax L5P CNC-424005 3L trucks get olderGet 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