65 dart GT floor shift

If it's the little square box with 2 wires coming out of it and a small round button on one side, it's for the back-up lights. It mounts to the side of the shifter so that when the lever is in reverse, the button on the side of the switch is pushed in, completing the circuit for the B/U lights. 65 neutral saftey switch is a single prong switch mounted on the tranny. Hope this helps