Do you have a set of a/c gages?
Can you hook them up and tell me what the high and low side readings are for three stages please
1st stage engine off
2nd stage engine running with a/c on
3rd stage engine running 2000 rpms and a/c on please
let me know the highest reading for high side and lowest reading for low please
does your a/c gages have a high and a low gage? one red and one blue, or are you using the gage on the refiller can?
It is not hard to do this
And you will save a bunch of money doing it your self