Your original Mopar Truck tachometer has a paper printed circuit board inside it. The original printed circuit board is by now around 30 years old, and many of the electronic components on the board are likely to have degraded over time. The new fiberglass printed circuit board that comes in our kit uses modern integrated circuits that are more reliable and accurate than the original parts. The original circuit board has an adjusting potentiometer that is open to the enviroment, and these pots get noisy and corroded over time. The new circuit board has a high quality 15 turn adjustment potentiometer that is sealed from the enviroment, so they should last many years with no problem.
Installation instructions and access to RT-Eng rebuilding your tach for you is available here -
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