I am trying to install an NOS digital tach into my 75 Hurst Olds and need to know what wires go where. I can't find anything in the service manuals. Any help would be appreciated.

The wires are red, white and black, shouldn't hard to wire in once I know which one goes where.

Thanks

 

I'm gonna wing it here, white-tach, red power, black ground. Those were a pretty neat unit in their day.

 

Here you go...

 

Thanks guys got it in and working perfectly.