90 supra dash harness need help asap PLEASE

[mikes_88_supra]

So here's the problem im in the process of a 1jz swap into my 90 supra it was a 7mgte auto and i don't have the engine harness from it. so i bought one from a 90 and the body plugs don't match up. here's the questions can i change the body plugs on either the engine harness or the dash harness so that they match. also what are these two plugs there both on the passenger side 1 (the Grey one is m1) is attached to the harness coming from the gauges and stereo. the other (the white one) is coming from the dash harness and is located behind the passenger side kick panel. I've been told that the white 1 is just for the 90 models but no one seems to no what the hell it is for and what it plugs into. if any one has any idea about any of this please please help me as im kinda retarded when it comes to these plugs.

 

[mikes_88_supra]

these are the body plugs i was refering to the 1st pic is of the harness i purchased which i believe is a 89 turbo 5speed the second is of my car which is a 90 turbo auto

 

[Satan]

Many of the signals are the same, but the connectors are different depending on model year/trim. I have soldered in the right connection before. Just gotta find a car at the junkyard and cut the right connector off with enough wire to extend/solder. It's a PITA, but easier than removing/replacing the dash harness again.

 

[mikes_88_supra]

so im pretty sure the harness i bought that was supposed to be from a 89+ supra isn't from a supra. cuz it has body plugs on it that never came from a supra so does any body have any idea about what it might be from the pic is in the first or second post