no high pressure rv2 help!

IF you can eliminate it without compromising the internals of the compressor, the system would work without it. For example, the aftermarket "hang on" A/C in my old RR had no such component, and in fact, the only two controls on compressor operation was a low pressure switch in series with the off/on and temp control under the dash.

I believe the gauge port is on the evap side of the valve however, so if the valve was stuck closed, you should be getting higher than normal pressure rather than lower.

Look at the diagram in the shop manual