I have a 98 CL 3.0 air is cold, gauge is at 25 PSI
What should the PSI be at for Coldest AC

I live in FL so it is hot

 

You need the first gen side.

 

Static pressure for the Ac should be 70psi and may be higher depending on outside temp. Operating pressure 25-35 on low and 200-300 on high, but perfect amount of refrigerant in the system can not be determined by mesuring pressures . Its done by weighing during fillup. Being slightly off with ref. wont change anything as most of the gas sits in receiver/dryer that works as sort of buffer