It doesnt suck as bad as you think, get the wiring diagrams for the S14 and make yourselfa pinout for the ECU, then just match up the relevant wires, constant power, switched power, fuel pump, so on. After that, it should be cake for the trans wires.
You will be able to figure it out, I am sure...plus think of the pride of having done it all yourself instead of depending on someone else to do the leg work.
If you need any help, email me at
[email protected] or AIM:jonpowellsRB25. I havent done the S14 wiring, but I don have some manuals laying around I can look through to possibly help you out.