Wiring: What to take from donor?

[M3PO]

Hi everyone, I acquired an S54 and it came with three harnesses, the main harness, the coil harness, and the O2 harness with the relays. I don't have a DME yet but from what I can tell, there are four slots to fill. The fourth one being the connection to the body. There is a donor local to me that I am planning to pull the harness out of.

So my question is what do I need from the body harness? OBD2, pedal wiring, sport button, is that it?

What does this fourth connector look like (and/or its name)? Do I pull all of the wiring associate with this plug?

[M3PO]

Well here is the answer to this question:

1) X60004 DME Plug, 40 Pin that goes on the 4th slot on the MSS54
2) Throttle Pedal sensor plug
3) OBD2 Port
4) EKP Modul for the fuel pump, in the trunk on the coupe, behind rear seat trim panel on the vert
5) Optional: Sport button, can always wire any button you want to the two sport button wires on the X60004