Well I think I can say i've seen it all. Worked on a 20 ton train split system today, Found a bad txv valve a week or so back. Scheduled the repair, go and recover the refrigerant. remove the bad power head (bolt together) and to my suprise the gage was gone! The evap coil has 4 expansion valves with hot gas by pass, so this was keeping it running. First time for this one.