Jim is correct,but there are a few other differences in the 89-92 harness'.The plugs into the ECU are the same,but the plugs for the underdash harness change,as do the pinouts for those wires.
I have had 87,88,89,90 harness',the 87-8 were identical,89 all by itself,90 was different again.I just looked ata 92 harness yesterday,looks close "from memory" to the 90.I'll know fairly soon,as I will be helping Bill P. with his 7mgte,and pulling what little hair I have left,while figuring out the wiring again :lol: