Neutral Safety Switch wiring

The middle terminal of the NS switch IS the neutral switch. the outer two are the backup lamps

The center pin of the NSS goes to one of the push--on terminals of the firewall mount starter relay. Makes no difference which. The other terminal comes from the "start" wire from the key, used to be yellow.

Be careful with these "GM" based wiring. Your Mopar has a few differences

The coil bypass circuit on Ford/ GM is on the starter solenoid. But Mopars have a separate bypass FROM THE IGNITION SWITCH, used to be brown, or "ign 2." This runs directly to the coil, and you'll probably either have to run a separate wire, or there is a couple of other ways.

What brand and part no. harness did you buy?

And, do you have an original diagram?