From the factory, the 61 and 62 would have used two trim screws to mount the tach head to the side of the steering column. Chrome tach cup with a black bracket. The aftermarket Sun tachs cam with a screw clamp and a strip of black rubber, to protect the steering column. Hope this helps!
FYI, all RC 7 tach heads were bascically the same; no-redline, redline, red-football, what ever. You can get a RC 7 head and have a face put on for whatever application you want. If you want a factory look tach, get an aftermarket one (they all need to be rebuilt and refaced anyway) and have a tach rebuilder put on the 327 or the 409 redline face. You'll also want to have them rebuild the EB9A sender for solid state. No more mercury batteries!
Ross