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|I've sent my speedo and tach to nisonger instruments for rebuilding. Luckily I read that the only electric ignition system that they can calabrate to is a Petronix. I've purchased a "classic" replacment tach which is very similar to the original but I'm not sure of the connection. The car has the standard Green, black, white and white/slate.
The Nisonger instructions show:
Green: fused power source
Black: Metal ground
Brown/Grey: Trim off, not used
Red/White: Light harness
White: only for electronic ignition-Connect to tach prot of ignition module. Do not connect to a tach adaptor box.
Long story short. I'm assuming green to green but anyone know which lead the "white" on the new tach goes to. White/Slate or plain White?
Please add any relevent info.