[Eastonspeedworks]

Are you absolutely certain your tachometer works? I'm pretty sure I've seen factory tachs hooked up to an hei before. Something I learned that may or may not be helpful is on my ls engine my tachometer wouldn't work at all after the swap all the wiring was proper but it would raise to zero and that was all. After some digging I found that they don't have a strong enough signal to run the tachometer so you have to add a 10k resistor between a key on hot and the signal wire to boost the signal. It worked like a charm maybe consider that before buying all this stuff that might not work.