I suspect the Sun tach (looks to be somewhat old) in my 1970 Coronet is not reading accurately at higher RPMs. "Feels" like it's ok at idle or low RPMs. I've heard that some older tach have problems with Mopar electronic ignition, so I'm not sure if this is a factor.

I was wondering if it would be possible to have two tachs running a car simultaneously?? From what I remember, a tach gets it's info from the negative side of the coil, right? If I had another tach and powered it from the right source and added it's wire to the one from the Sun tach at the coil now, would that work?

Thanks a lot!

--Stan