(top row from left) EFI fuse block, EFI relay pack, Baro sensor, Self-test plugs, Computer
(bottom row from left) Main vehicle fuse block, Main battery possitive terminal, Starter seloniod, Check engine light

Dash connections, Oil PSI, Temp, Tach. Ignition switch connections Run & start.
Fuel pump connection

This is a Spy photo I took of a NEW Ford EFI harness. These 4 wires were cutoff and taped over inside. Proof that this harness is not designed for EFI swaps, simply a left-overs re-sold to the public.

This is the un-used "low Oil level" light that is inside the Ford EFI harness. This wire is in the O2 harness and continues all the way to the green connector by the EEC plug.

It seems that Ford used jumper wires inside different harnesses to conect ciruits in other harnesses. This is confusing at best. I have found 3 different jumper configurations in the O2 harness so far.