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Pretty low for sure.
I would leak check with what is left inside. Recover and dispose of the remaining. Repair the leak.
Evacuate and charge circuit 1.
500# is pretty up there too but looks as though the side panel was off.
When I worked on reciprocating equipment, I would on occasion come across a system that would give the high side gauge a good shaking as you described.
I would sometimes run a bit of refrigerant from the low side of the machine through the charging hose (purge the hose), then seal the hose to the gauge set and close the low side gauge valve and open the sealed charging hose to the high side of the compressor. Sometimes the extra volume on that the hose offered would stabilize the high side gauge and stop the fluctuation.
That being said, I have seen systems with non condensibles inside behave in a similar fashion and also overcharged systems.
Again, only trying to offer some options and it is tough to troubleshoot from the keyboard.
__________________
Bill K.
"I started out with nothin and I still got most of it left...."
83 911 SC Guards Red (now gone)
And I sold a bunch of parts I hadn't installed yet.
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