blue and white is the DME's signal that the AC is on for the idle. It connects to the two purple wires which send 12V to it.
That leaves the other two. One shows "not in use" on the wiring diagram, and the other is the gear selector or range switch. For automatic I'm guessing.
Thanks for looking everybody.
09 Jetta CleanDiesel M6 Highline
85 325e M5
07 Honda Shadow Spirit 750