Review on π Hypertech 752504 Speedometer Calibrator: Enhancing Speedometer Accuracy and Performance by Chuck Shapiro
Use this for 2021 Ram HD
Download the software from Hypertech website and update the firmware on the device instantly. When the update is complete, just follow the prompts to plug it in and change your tire size. HOW TO GET CONSISTENT PERFORMANCE. The USB port on the back of the passenger-side center console provides enough power to run Hypertech with the ignition off when needed. No other ports or cigarette lighter work.
- Superb design
- Crumpled packaging
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