I got a 700r out of an 89 chevy pickup and put it in a rat rod i'm building and after reading a lot of different comments i don't know if it is computer controlled or not the plugin has three wires in it come sights say i just need 1 hot and 1 ground but all 3 wires went somewhere. i also need to know which wire off the speedo sensor goes to ground. the wire colours are different than what the wiring schematic says that i got with my wiring harness tks.