Been tinkering with this for some time. Just noticed today for some reason that when the Sun tach is at 4000 rpm and the engine is missing the factory cable driven tach is 5000 to 5500. I was prety sure that I have a distributor bushing problem but now I am wondering if it it the distriburor or the tach? Any thoughts? First step is to un hook the Sun tach but since my generator took a dump today I need to get it fixed first. Any suggestions for a larger pulley for the generator? The Hi po mustangs and Hi po big block Fords used one to keep from over reving the alternator and generator. There is a repo of the mustang one avallable.