If your looking to swap engine PCM'*
stay in the years from 1991-1993 these years interchange
1994-1995 interchange but not with 1993 and older
if you ever want to look up parts for your car and want to see what model years interchange go to
Car-Part.com--Used Auto Parts Market
very good web site. They use the Hollander interchange. Very trusted. Almost never wrong.
Also you made mention that the 'professional' that installed the car alarm tapped into the computer pin out. Do you remember which one he tapped into. Or is there a way for you to look. Only reason I ask is because if you can tell us which one he tapped into, we can tell you what pin out he may have fried.
Also just because a sensor looks fine doesn't mean it is. Have an experienced mechanic do a sensor scan/map out the sensors reactions to his test. This way you can pin point which sensors are working/reading correctly and which ones are not.
you may use this for pin out reference:
Thanks to Danthurs for this.
Hope this helps.