Piston,
With out reading all the last postings, I don't think you are going to get someone just telling you to plug wire “a” into spot” b”. You need to know the details of each wire.
I have lots of data that might help, start with the helms manual on your car, it will show you every pin on the PCM and what the wire does.
You need a relay when you want to run a something that takes a lot of current. Like your headlights or fuel pump. The PCM is a switch and it cant take much current so you have it close a small current relay that will than close and allow a lot of current to flow to the head lights or fuel pump etc...
Do you know how to read a wiring diagram? I took a 280Z diagram and have change it to match my 280Z with a 95 LT1.. It would help you a lot.. Also Its not a couple hour job for a beginner to figure all this out.. I have many, many hours getting it right and doing a lot of tweaking to suit my fussiness.