That harness won't work in an 87 unless it is modified. You will need a 89 or 87-88 converted to maf harness. On the 91 check the driver sode of the harness where it plugs into the dash harness, by the self test plug, for either blk & gry plugs or one red plug. If you look on your car you should have the 2(blk & gry) plugs. I think the 91's had the one red plug unlike the 87-90's. And even though the 90 harness's had the 2(blk & gry) they won't work either, without some modifing. Been there done that swap. We tried to use a 90 harness in an 87 4-8 swap and the fuel pump wouldn't come on, swapped in an 89 harness and it fired right up. The modification to the 90 harness, I have never done, and not quite sure exactly how. But for I gathered you will have to run a wire to the fuel pump relay so it can get power when the key is on. Instead of doing that I just swapped harnesses...
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