To get my AC to work, shorted out my AC evaporator switch (rests atop evaporator). As a consequence, even after restoring to original state, my climate controls, power windows, auto seat belt retractors or tach now do not work. Apparently, my screwing around has shorted something out. Any suggestions as to what I can do to correct?

Did you check all your fuses, relays, & fusible links?

 

If everything is good, you may have fried something.

 

I scanned the electrical section from the 90 factory manual. It should be the same for the 91

http://www.main.experiencetherave.com:8080/subaru_manual_scans/FSM_Scans/1990_Legacy_Wiring_Diagrams.zip

Based on the diagram and the list of non-functional items, I'd start by looking at fuse number 15.