John, here's an older post with some good photos that will probably help you out.
Look for Jugerfroch's post.
https://www.stovebolt.com/ubbthreads/ubbthreads.php?ubb=showflat&Number=750127The two speed is fairly simple. Basically you supply 12v to the switch from a keyed source. (i used a relay to reduce the load on a 60 year old key switch) The switch sends 12v to one of two wires on the motor. When on low, 12v is also supplied to the speedometer adapter so that your speedo reads correctly no matter which gear the rear is in. I replaced all the wiring on mine with 12-3 copper ( think drop cord). You only need two of those wires to run the motor ( one high and one low) so I used the third to ground the motor case to battery ground. I know the switch and motor are available at NAPA and I think the switch wiring harness is too, though it's been quite a while since I bought one of those.
Scott
