Speedometer and cable

[Trevor Triumph]

On my wife's Spitfire MkII with a late single rail transmission and J overdrive... When I use a stub of speedo cable into the angle drive the cable spins as the car moves. I think the speedo should work. I hook up the full cable and it does not spin. The same cable, speedo combination works in the other car, same kind of transmission and overdrive. I wanted to drive a rally today and started this quest last weekend. How hard could it be... excahnge speedo and cable. T.T.

 

[Brosky]

OK, so the next logical question is, if you spin your cable, disconnected from the angle drive but connected to the speedometer, does the speedo needle move?

 

[Trevor Triumph]

Good question. Thanks, I try that when I get home.
T.T.