Russ69, My car was originally an automatic. it was pointed out by someone in passing to look into the back up light switch as automatic is in the steering column. After lots of looking at the schematic and a lot of tracing under the dash and in the steering column, I decided the best/easiest way was where the wiring bundle to the trunk, driver side floor at the front of the door, I forget what color wire, but locate the wire to back up lights, (schematic) cut, splice length of wire, run under flooring to shifter opening and down to transmission, that's the return, then bring power from another source and plug both into the reverse de-tent switch on the transmission.