A/C Charge by Myself

The use of a refrigerating compressor is not really right, but if you make sure it has enough oil in it, pull 27 inches of vacuum, turn it off, see it hold that vacuum overnight, then run it another hour or two, it will pull the moisture out.
I made my own a long time ago, back when I built an AC system for my house.
I sealed the tubing ends and used clamp on line piercing access ports to have real Schrader fittings to use with a manifold gauge set.
Propane in an AC system scares the hell out of me. I hate fireballs in my face.
Never do this please.