Datsv8r Posted December 27, 2014 Share Posted December 27, 2014 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. Quote Link to comment Share on other sites More sharing options...
NewZed Posted December 27, 2014 Share Posted December 27, 2014 (edited) 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 December 27, 2014 by NewZed Quote Link to comment Share on other sites More sharing options...
jhm Posted December 30, 2014 Share Posted December 30, 2014 Fairly common issue w/ V8 swaps....and there can be multiple issues/resolutions to the problem. Here's one of many threads in HBZ on this subject: http://forums.hybridz.org/topic/106140-tack-not-working-right-sbc-with-hei-coil/?hl=%2Bstock+%2Btach&do=findComment&comment=993151 Quote Link to comment Share on other sites More sharing options...
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