Whoops, you are right Dutch I'm using an accumulator not a dryer I used the wrong word for that. There has been a bit of a squeak from either the compressor or belt tensioner, but it would go away after a few minutes. Now the compressor seems unusually easy to turn, there is a slight drag but I can turn it with one finger with a stub ratchet. Also the wiring for the compressor switch it run on it's own circuit (not using any of the factory stuff).
Good news. 1) The compressor should be easy to turn with no sticking and binding. 2) If the compressor was eating itself you would find debris in the oil and orifice tube. With the limited info suppied yesterday, I could not determine if there was a filter medium between the orifice tube and the condenser. 3) A high pressure relief valve for a Sanden is about 5 bucks. Verify this is the correct part. https://www.finditparts.com/products...xoCXU4QAvD_BwE
Bad news. 1) Can't find a pressure rating for the high-pressure relief valve. 2) Only 2 ways I know of to confirm the compressor is good. One involves a $5000.00 test bench. The other is on the car and detailed in section 7 of the attached pdf. I suggest you read through the pdf. The compressor must be forced to output 350 psi. Details are in pdf. If it passes and the oil is relatively clean and not black, the compressor can be put back into service. Their words, not mine. 3) To test the compressor, it must be mounted and fully evacuated, oiled, and charged. That's the gamble. 4) If your oil is metal flake you can expect to find it throughout most of the system. Mostly in the condenser. If you ave a parallel flow condenser, you'll need to replace it because they are nearly impossible to clean properly and plug up easily. A blockage can close a flow channel because the channels are tiny compared to a tube-type condenser. 5) Metal flake oil? Flush the entire system excluding orifice tube, compressor, accumulator. 6)Replace accumulator any time you open the system,
Drain, capture then measure your compressor oil. Turn the compressor shaft to get all oil out. Check the condition of oil. Metal flakes? No bueno. Black oil means oil has been overheated. No bueno.
I don't understand your wiring issue of the high-pressure switch. (NOT SMART AZZ OR DEROGATORY) Do you understand it and can you be sure of your work or do you need help? Maybe you can sketch a diagram and post a picture.
Make sure you purge your a/c gauge lines any time you hook them up.