[pgermond]

Joea,

Okay, here is what happened to me with my Autometer and reverser - a process of step-by-step elimination.

Got the car running and no speddo action.

1. Disconnected the cable at the reverser, drove the car and discovered the cable was not turning. What I found was the cable had snapped and the nylon speedo gear in that inserts into the trans was all chewed up.
2. Replaced the gear and installed a new cable.
3. Drove the car with the speedo cable disconnected from the reverse and insured it was spinning.
4. Connected the reverser to speedo cable (reverser disconnected from speedo) to insure the shaft that goes into the reverser was spininng in the opposite direction as the cable.
5. Connected the reverser (with cable connected to the speedo). I could here an unpleasant noise as I slowly edged the car forward and the speedo wasn't moving. I discovered if I loosened the collar that holds the reverser to the speedo it would work.
6. I pulled that shaft that drives the speedo from the reverser and trim down its length.
7. Presto! Success. The shaft between the speedo and reverser was to long - once I trimmed it all was well.

To answer your original question - the chain has a square end, and the shaft between the speedo and reverser is also square. If you need a reverser and shaft, I have an extra of both (new, in the box).

Hope this helps - if not, holler.