NSS Wiring Help

You can use either the shifter switch or the transmission switch. On earlier cars the reverse lights did not appear a t the bulkhead connector unless it was a "stick" car (and maybe even then only for 4 speed cars, I do not remember)

If you go to MyMopar and download 'the closest you can find' of a shop manual AND get the 66 aftermarket wiring diagrams on that page, they will show the connector routing for that wiring.

You need to disconnect it at the column, run them out into the engine bay, and connect to the two outer NSS pins. I assume? you already have the 3 pin connector for the transmission

The original wiring was down near the bottom of the column if column shift, and on the console shifter if that was used