Overspendin'

I hope this is the right board to post...
Installed my Covans/Autometer gauge kit, everything fits great EXCEPT the electronic sending unit for the speedo.
I have already destroyed one gear drive trying to force the Autometer sending unit to fit.
Went to my local GM dealer, got a new gear drive, installed it on my transmission, same problem.
I measured both units with calipers and it appears that the outside diameter of the OEM GM gear drive is just slightly larger than the inside diameter of the Autometer sending unit.
These two pieces do not want to fit together.
Could anybody who has successfully installed one of these units put me on the right track?
I will be forced to drive my Beetle until I can fix this problem.

Timz2882

iTrader: (1)

ill be findin out in about 2 weeks when i put mine in. i just need to buy the sending unit and see if it will bolt on to my th350. my friend has the same unit on his 82 monty with a 454bbc in and all digital gauges and his bolted on no problem.