Magnum Neutral Safety Switch, effect idle? and wiring?

Hi guys. 97 stock efi obdII swap. Getting a code for NSS. A 3 pin connector.
First of all, if the NSS is not operating will it effect the idle?
While trying to fix, I am curious what triggers the code, the center pin only?
Pic below of pin-out.

-Can I focus only on the center pin to get the NSS to work? I don't care about the reverse lights (outer pins) right now. OR, do the outer pins ground the center?

-I have located the center wire: Brown/Orange
-Also located the third wire: Violet/Black
-It calls for a white wire for the 1st pin but I can not locate it. There is a Black/green wire (the only unaccounted for wire in the trans harness that is right at the bundle of other NSS wires but I am skeptical in hooking it up to NSS (it is a Black/Green, slightly larger gauge wire and I doubt manual is wrong about color but is it possible?)
Thanks for any ideas!

NSS.jpeg