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marinez

Ignition signal from engine compartment to tach...

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No hug?

 

You need to add some detail.  There are some considerations and some simple tests you can do.  It's not even clear what you mean by nothing.  Could mean no blue wire, could mean blue wire doesn't work.  Could be the resistor fell out.

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Do you know what the signal is?  Did you measure voltage at the tach end of the blue wire?  Have you looked at the wiring diagram?

 

Really, the basics are pretty easy with a meter.  Get everything connected correctly, then you can focus on why the needle doesn't move.  With a meter you don't have to worry about what the terminals look like.

 

Who recalibrated your tach, and is it the stock 1975 280Z tach?  Are you using the stock 280Z harness connection at the tach?  Aftermarket tachs can have different wiring schemes.

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With the key On you should see battery voltage at the tach end of the wire if it's connected to the coil negative terminal as it should be.  The 280Z tach just counts the voltage pulses on the negative post of the coil as the coil charges and discharges.

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I don't know what means.  But, good luck with it.  

 

I have a GM HEI system, module and coil, on my L6, using the 280Z VR signal.  My tach doesn't work without a condenser on the negative terminal wire.

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