I got the charade transmission, I believe they were all the same from the late 80's to early 90's. It had the linkage attached. The shifter mechanism is attached to a long bar that screws into the bottom. They cut the bottom out of the cup holder and put a little cover over the top. There was one on ebay in TX at that time for $125. but I don't know how hard it is to find the shifter by itself. I can't find a reverse on mine, but there's no need.
I don't know of anyone who makes that trip, but I'll ask around. 6500 rpm! That's where the redline is on the rpm meter. I figured it was just left over from the previous model. I still try not to exceed 40 mph. It's been extremely hot here and I'm not sure of the motor overheating, as well as the rpm spec, if there is one. There is a fan on the controller, but no cooling asistance for the motor. The rpm guage is hooked to the transmission so I have no idea of the real motor rpm. When I slip it out of gear it still goes with the speed of the vehicle.