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HybridZ

tach hookup help please


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I have tried all I have read but my tach does not work properly. I will get a reading of about 1.2 k rpms at idle then if I give it throttle it dies. If I rev it it will jump to 4 or 5 k then die. This is a stock hei module v8 dist to the stock datsun tach. I am pulling my hair out trying to figure this out. Please help.

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The Z tachs are kind of sensitive to the signal they get.  There's a 2300 ohm resistor in the circuit to the tachometer so they don't need much.

 

I had a GM HEI module setup with a ZX coil that would only quiver the tach needle until I added a capacitor (typical alternator condenser) to the negative side of the coil.  It worked fine then.  Might be worth a try.  It's cheap and won't hurt.

 

Forgot to say though, that with 8 cylinders instead of 6 it won't read right anyway.

 

Edit - before too much fiddling you might consider making something like this work and get it all done at once - http://www.technoversions.com/

Edited by NewZed
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