Hello,
I have a question about the correct connection of the original tachometer from Oldsmobile Starfire 1964 - 1966 (see photo) to Oldsmobile Dynamic 88 1966 425 cui V8
The blue wire to the negative pole of the coil and the brown ground is so correctly connected to the tachometer (photo) Hello,
The only thing not connected is the tachometer lighting, because someone has removed it in the past.
The tachometer works like this but shows a speed of max. 3,000 rpm, after opening the hand is free, I suspect that it was used, for example, in the V6 engine and it is necessary to adjust it, inside you can adjust the wheel.

Thanks