Hi Peter, Sorry I havent responded to your reply I havent been available all week. This is an orignal 1965 GTO ralley guage cluster you had restored for me and I am nearing the point of installation, just a little fuzzy on the wireing yet. it was originally a points car but changed the dist. to a Prutronix flame thrower. Do I use the brown wire which is currently taped back from factory and has a small fuse in it to energize the tach. I believe it is considered a auxillary wire or is there a different wire I need to use or do I not use any wire to energize. Also do I ground the tach and where do I attach the ground. Thank you Bryan Henn

Hi, what year, make and model car are you working on? It the car an original rally gauge option car? What version of the factory tach is in the car presently? A single terminal points only; or the optional 2 terminal transistorized ignition style? I don't recall any conversion with you prior. It would be best to call with any further questions. 1-614-258-3500 thanks, Pete