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Looks like the low pressure switch gets power from a 10amp ac fuse. Power then goes to the ac relay which is powered on by the ac heat controller on the dash. Power then goes thru the high pressure switch to the compressor. The ac relay is grounded to the body. Do you have power on the lite and dark green wires going into the relay and is it grounded ?
there is a fuse for the gauges, if you have an owners manual it will tell you exactly where it is, if not there is a fuse panel inside, either under the dash on drivers side, by the driver side kick panel, or on the side of the dash that faces the door.. and there is also a fuse/relay panel under the hood.
hope this helps.
You can check out your local auto parts store for a Haynes or Clymer repair manual. I know that AutoZone, O'Reilly's, and Advance Auto Parts all carry these manuals at a cost of $20-$25. They contain the wiring diagrams for the major electrical systems. Unfortunately that's probably going to be one of the few sources for a vehicle that old. I happen to own an 85 Chevy Silverado 1/2 ton. What type of problem are you experiencing? Perhaps I could assist you.
Your book should give you program options for the door locks If your fob wont work either you got a relay for the door lock bad it is located in the fuse panel push the door lock button and find the one that is clicking