Ray,

I came up empty. I cannot locate a driver's air compressor driven as you describe, and the two listed, one pre "R" serial number (which yours falls into) and the post "R" serial number compressors are driven off the cooling fan right angle gear box.

Neither have pressure switches.

I'm leaning towards thinking yours is a CC component, and if CC is confused it may be possible that somewhere down the line someone changed it out and substituted for what you have.

Jerry: Perhaps your drawings could reflect an AC compressor for driver's air driven from alternator belts, on the RH side of the engine. The coach is a 92 XL, serial no. N XXXX.

Sorry.