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Thanks to everybody on the thread. It was the brown single wire coming thru the firewall.. I looked under the dash and I looks like there it is a grey wire with a black tracer (I think it was) but somehow it must have changed at the firewall to the brown wire in the engine compartment...
But...
Thanks for the help, I am trying to reconnect my factory Tach. Its a Factory A/C car and there is what looks like a dark green wire with the by the heater fan connector/s that is cut clear. Could that be it? There is another brown wire coming thru the firewall closer by the brake booster cut...
Thanks guys, I should have stated.... I am working on a 69 non rally dash.. I didn't see where to connect it on the back of the tach.. I keep forgetting the tach has to independently powered I put the harness in the car a while back.. I have this to get squared away and connect up the cigarette...
Thanks so much for the great help... I just ordered the starter relay.. I figured the relay was jacked up. Didn't think about that plug being the neutral safety switch, and that red conductor going thru the firewall in the tach location is something they probably had for the electric radiator...
Three questions here and please reference the attached pictures.
1. Exactly where would the correct place be to run to tach wire thru the firewall with the harness I bought??
2. What is the yellow wire doing coming from the firewall connection block to the relay? Looks like a cobbled up mess...