tach wiring 1963 chevy

I own a 1963 Impala with a 409. It has the in dash tach. It is not wired to anything. Does anyone know where the wire that is marked 8cyl on the back of the tach is supposed to go. Thanks.:smooch:

distributor (-) side o coil

Thanks for the info. That helps a lot. As soon as I get the car back from the muffler shop I will wire the tach. Thanks again

Joel