Automotive Air Conditioning Information Forum

First thank you in advance for any and all replys.
Ok so 97 Chevrolet tahoe 5.7 with out rear air.
What's new, everything except the compressor.
Including hi/low cut out switches and the control head unit.
I added <8oz of pag 150.
I added 36 oz of 134a.
When the compressor engages
Low side is at ...