I don't know that you're going to find a lot of people who will type out precisely which wires you keep and which you discard. If you're experienced with swaps and EFI systems this should be relatively simple.
I'm not sure where to find a '85 wiring diagram and there are differences between '85 and earlier, and '86 and later... I do not know how extensive those changes are but anyway, you'll find the wiring diagram for '86+ in the service manual located here:
http://www.cygnusx1.net/Supra/Library/TSRM/MK2/