Neutral safety switch question

[sjarrett71]

I just put a new (used) under dash harness on my 72. I'm thinking that the donor harness came off a stick shift. The reason is the new harness doesn't have the two thick purple wires that attach to the right side of the switch. I partially took apart my old harness and one of the wires goes to the fuse block and the other looks like it goes to the ignition switch. My new harness looks like it has the thick purple one on the ignition switch but not the fuse block. None of the wires on my new harness were cut either. My question is, do I need the two thick purple wires and what do they do? Does anyone have a wiring schematic for the neutral safety switch?