So I don't know what compressor you have and that may be why the cutout is 325psi but that is no good and will not allow you to meet the necessary pressure to condense that R134 vapor back to liquid at high ambient temps.
For R134a you have to run high pressure. Higher than R12 to get "red zone" cooling.
Here are the specs you want for a binary(no fans) or trinary switch (fans better)
These are all measured on the Hi side as the switch is installed in the liquid #6 line (Hi Pressure) after the last condenser and before or at the drier.
Hi Safety Cut off 405PSI Saves the compressor cuts the clutch
Fan Cut On 240/250 +- PSI ie., the fans will come on and run until you hit 405. That should rarely happen
Fan Cut Off 180PSI The fans come on at 240/250 and then stay on as the pressures drop and off at 180. You want this 60-70PSI difference so that the fans do not cycle unnecessarily on and off.
Low Safety Cut off 30PSI Refrigerant leaked out... low cut off saves the compressor by cutting the clutch.
Pressure switches fail sometimes and for this reason they should be be able to be replaced without evacuating the system
Good video local San Antonio here: You don't need the temp control part though.
https://www.vintageair.com/tech-video-installing-a-trinary-switch/