>>28469951
This picture is revved up to about 1500-2000 rpms.
The pressure drop on the low side looks a little weird. Could be the impurities from the grille bottle or just weird old a/c design that's not as stable.
I replaced the expansion valve and receiver dryer and rebuilt the RV2 compressor.

This is just a test. I'm going to see how it does during the day in the sun. Make sure there's no leaks. Then most likely I'll order the Frosty Cool 12a and charge it with the proper stuff.