I am installing all new components for my trucks AC system today. I have a vacuum and R-134 refrigerant, with PAG oil too. The FSM states that the system should take 32 ounces to fill. Is there a pressure I want to hit on the low side gauge or high side gauge when I am charging? I have 12 ounce cans so I will need to leave 4 ounces behind in my last can, was thinking the gauges may help me with this.

 

generally you never want your high side to go above 240. your low side with fluctuate alot. when all is said and done the gauges should be pretty close to even.