If your 1962-74 tachometer is not functioning, the Cross Gear in the distributor may be stripped. When it fails, the mainshaft is usually damaged also. We recommend replacing them with our matched set:
Tech Tip: To prevent future problems, we highly recommend reducing the stress on the Cross Gear with either our Tachometer and Speedometer Drive Adapter #609-463 or Tachometer Cable Adapter #609-465.
Eliminate Tachometer Drive Gear Failure
Replace damaged mainshaft gears
Improved OEM Style