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  1. Valor

    Tachometer testing

    So with the yellow sending unit you check for short and open with ohmmeter and with the black sending unit you check for a voltage? Are these units interchangable? Seems like not. Must be different wiring for each. I have a yellow sending unit that I thought was bad but it is not. I still...
  2. Valor

    Tachometer testing

    I have mine working. I have the 4 terminal tach in a civy suburban and it works great. The signal is a sawtooth wave. You can get a square wave generator and hook it up to the tack and see it work. I did that. Make sure your rpm sending unit is working, use the drill test with voltmeter...
  3. Valor

    Tachometer testing

    Yes and yes! https://www.steelsoldiers.com/threads/tach-sender.174977/
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