1990 Toyota MR2 stereo wiring?

I'm a noob and I cant get my deck to work, I need a wiring diagram for a 1990 Toyota MR2, the wire harnesses they sell here only match 1991 MR2's So I have to figure out which wire is which from Toyota. Need help!

If there is any other way to do this myself please post, Thanks

If I remember correct, the second gen MR2 from 90-93 (at least in Canada) all used a factory amplified system. There were 4 amplifiers, one in either rear quarter panel and another two that drove the rear woofers that are behind the seats down low. Now for the life of me I cannot remember a simple tie in to the factory amplified system. Let me check my notes (if I can find them) on this car. For some reason I think it was a total rewire as I know that this is what I ended up doing with the 93 MR2 that I had. (thus my user name of MR2NR (Mr.Tuner)on other forums). I sold my car to one of my friends and I am pretty darn sure that my notes might have gone with it as I gave him the service manuals as well. If I find the notes, I'll send you the info.