I have a 1980 El Camino that I think originally had a V6 engine and when I bought it it had no engine. I had a 350 put in and the Tachometer and guages are working (original equipment installed from factory). Only problem is that the Tachometer reads a lot higher than it should. I have taken the Tach out of the cluster and looked everywhere for a V6/V8 selection and can't find anything. There is a Tach fliter between the Distributor and ??? I do know that this filter is mounted on the firewall and one end goes to the Distributor and not sure where and IF the other end is connected. (Finally the question) How do I adjust the Tachometer for the V8 installed now from the possible V6 originally installed? HELP!