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Incidentally, I figured out the tach drive gear solution on my original 67 distributor, and without drilling the hole through the housing (as recommended).
The housing was so worn with a depression and a cone in the middle at the point where the tach gear rubs against the housing. So I got one of these plastic buttons intended to fit in the hole of a replacement distributor. Cut the little ears off the plastic button, which were intended to go into the hole, but not all the way.
The remnants of the the little ears fit exactly in the worn depression and the back of the plastic button fit flush against the housing. Used Clem's advise to put it in with a little dab of grease. The remnants of the ears hold it in place after you screw in the retaining housing (with one of these new type gears with the bronze bearing plate).
Bench tested it out. No slop back and forth in the gear. Put it on the engine and the tach works smooth and fine. Works for me.
Having fun,
Jerry Fuccillo
#42179
The housing was so worn with a depression and a cone in the middle at the point where the tach gear rubs against the housing. So I got one of these plastic buttons intended to fit in the hole of a replacement distributor. Cut the little ears off the plastic button, which were intended to go into the hole, but not all the way.
The remnants of the the little ears fit exactly in the worn depression and the back of the plastic button fit flush against the housing. Used Clem's advise to put it in with a little dab of grease. The remnants of the ears hold it in place after you screw in the retaining housing (with one of these new type gears with the bronze bearing plate).
Bench tested it out. No slop back and forth in the gear. Put it on the engine and the tach works smooth and fine. Works for me.
Having fun,
Jerry Fuccillo
#42179