ecu,need help bad

If I buy another ecu for the 1ggte that is the same year and the same pins as my 7mgte wiring harness, will the 7mgte harness work with my 1ggte motor and ecu. See I have the ecu and the wiring harness that came with the 1ggte that I bought, but it has a different number of pins and the plug that are under the dash of my 88 supra have different ends then the ones on the 1ggte harness that I have now.I have seen ecu's on ebay for the 1ggte that has the same number of pins as the old 7mgte ecu and harness that I just took out.If these other ecu's will not work,then how do I wire the plug under the dish into the 1ggte harness?

Quit trying to salvage the old harness. Go in and put the correct harness and ECU in already. They are not interchangable. Used engines come with the ECU and harness for a reason. Why are you trying to do things the hard way?

Really

what do I do with the other plugs?

remove the old harness and replace it with the new one.

I have done that but there are three plugs near the the ecu that will not plug into the plug under the dash, need to know where they go?

Are they on the old harness or the new one? Are all your ECU connections made? If so, they maybe the body harness connections. There is a junction/relay block in the passenger foot well. There may be some wires, such as the starter wire, that may need to be spliced in.

The plugs that Im talking about run somewhere up under the dash,Idont know where they go? If I need to splice into these plugs, were can I get the wiring diagram,tried typing in wiring diagram on the internet but didnt find what I was looking for.

FSM for the MK III:

http://www.cygnusx1.net/supra/library/TSRM/index.html

For 1GGTE info:

http://www.toymods.org.au/

Also contact projectsupramk3.