OK, so at about 90 degrees outside with about 60% humidity I'm getting about 55 psi on the low side. I didn't even hook up high side. It's comfortable in the car but I wouldn't say it's freezing me out. This was also at idle, so I imagine it will help when more air is going across that condenser. This is with 24 oz. of 134 in the system.

Just wanted to post my findings. Any advice and thoughts welcome!