[JCs72C10]

I need a little help with wiring this switch.

What I know: there are two purple wires that connect the ignition switch, NSS, and the starter (the two pins on the left). I also know the light green wire sends power to the Reverse Lights.

What I don't know: what the hell the blue wire (in the same connector as the light green) connects to and what the final pin on the NSS connects to...

I've searched and searched... checked multiple diagrams.... I'm stumped....
I'm guessing the blue wire is a power source to the NSS for the Reverse lamps, but I don't have a clue what the other pin goes to or what color wire connects to the NSS pin itself. Any help would be greatly appreciated.