FEnatic Posted August 7, 2005 Share Posted August 7, 2005 I did the swap in my 75, followed the wiring instructions from the atlantic z site, but the blue wire that he says goes to the tach and ecu is supposed to be negative. With this wire hooked up, car will not run, no spark. I assumed it was grounding out somewhere, so I just unhooked it. Runs great now, but no tach. Question is, could the tach from my 75 be a positive ground or is there an inline resistor somewhere that is grounding it out? Quote Link to comment Share on other sites More sharing options...
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