I don't see the results of Lucid's suggestion to jumper the RSR; have you done that? Simply insert a wire jumper between the two heavier wires in the RSR connector. It sounds like you swapped out the RSR prior to posting, but are you sure it was the RSR and not the identical fan relay right beside it on the strut tower. If you insert a jumper and the fan comes on you are at the wrong connector.
Ground problems are not necessarily limited to cars in Northern climes, its a good idea to check and clean them on any car- especially one that is 20 years old.
You can fashion your own diagnostic pressure gauge with the fuel rail connections and a trip to your local hardware store:
Edit: ie "fuel rail connections" harvested from a parts car, pick and pull, ...
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