Everyone is exactly correct. Gm originally has the B/U light switch on the column with linkage to turn the steering wheel column. As a side note, with the factory linkage hooked up you must put the car in reverse to remove the key from the ignition. Hurst does make an aftermarket Reverse light switch with a bracket that can be attached to a Hust shifter. You need to run wires from the switch up under the dash and plug them into the factory reverse light wiring above the steering column.