Dan9

yes what I am saying is that the blue/white or blue/black wire at position 41(IIRC?) from ECU would not give a signal to an SE-R gauge cluster I tried to rig up.

I know that wire would not power teh Sunpro tach; for that one I am using the green/yellow(?) IIRC from the coil. But you can;t use that wire to power the gauge cluster tach; it shorts the car and it wont start.

Coo"?

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NissanSentralol

What exactly does a tach do for your car?

joenathan89

It is an information gauge. It informs you on how many rpms your engine is going. And if you dont know a rpm is a revolution per minute. So when your engine makes a complete stroke that is a revolution. Knowing your rpms can help in shift times and just being able to know how fast your engine is going.