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I have an 87 300zx NA and my tach isn't working. A test light showed voltage from the tach to the resistor, but not from the resistor to the alternator. Does anyone know the resistor value so I can replace it, or if you have any other idea of what is wrong.
 

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Tach resisitor would be 2.2 k-ohm.
The tacho should have no connection to the alternator. If it does then there are big electrical issues.
 
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