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The speedometer cable on a V8 Ford does NOT hook-up to the transmission. And the cable does NOT hook-up to a Model A trans, either. The cables on BOTH hook to a "turtle" which is mounted on the torque tube of each respective vehicle, as seen on this '35 Ford torque tube. DD
The "turtle" is a very simple affair which bolts directly onto the torque tube. It's gear meshes with the 'drive' gear which rotates with the drive shaft.
