Go to Promracing.com and watch this video Installing the Pro-M EFI Harness
It explains all the differences between the 91 and 92 Fox body harnesses. I am thinking about getting the set up for my 91, I am rebuilding it and really want a new harness but am worried about keeping it smog legal.
All I can say, which is good knowledge, is the pcm/ecm pin out on the connector from 89-93 is the same. The injector harness is the same 87-93. Airbags on the fox does not go through ecm.