If you need to route and wire your 2-1/16″ Nitrous LED Tachometer the information herein might help. The following diagram shows how to route and wire the device.
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How-to Guide: Wire Tachometer for the GM HEI Ignitions
This is a picture of Tachometer wiring connection for installation to the General Motor (GM) HEI ignitions. Please see how-to make switch adjusment if you want to operate the tacho for operation on 4 or 6 cylinder engines.
