NSS Wiring Help

Sorry about that,I read the post and was thinking that you were using the shifter switch for the back up lights already. So it sounds like your car was a console shift from the factory.Are you using a factory console shifter ? There should be 2 wires from the harness to the shifter,and one wire for the light that is usually orange. The other 2 wires according to the factory service manual are violet in color these can be used to connect the NSS going to each of the 2 extra wires/connections on the 3 prong plug. One of the violet wires should show power with the key on.The other violet wire will run back to the backup lights. Either violet wires can be hooked to the plug on either side as the switch completes the power transfer to the lights.