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I have a yellow wire with a banana plug at the bottom of the column that runs to a light with what looks like a fiber optic cable that shines on the ignition switch at the top of the column. Does anyone know where this yellow wire gets plugged in?

Looking for info on the tach wiring on a 1970 Duster 340. The tach has 2 terminals and I have the wire that runs thru the firewall to the - side of the coil. Does the other terminal on the tach get used and if so what is it wired to?