I have a 1965 and I bought a tach repleca set up from Hinshaws Chevelle that went in place of the clock and looked OEM. The tach I think was not a 270 degree face tach but sort of a sweep face tach that fit in the round hole. I was stock looking I remember that. I also got the replica set up that has gauges (oil pressure, water temp) instead of trigger lights in the third round hole in the dash.