I hope the fan is working when the A/c is on, but this will help.
http://www.denlorstools.com/autoblog/2009/04/adding-freon-to-car-ac-gauge-readings-explained/
Is the cooling fans working when the a/c is on? if not check for a bad cooling fan motor on the radiator. also what does the low side pressure show on the gauge if it is low then you may have a stuck expansion valve. what does the line prssure show on the gauges with the engine off ? if it shows more than 110 psi on both low and high sides your system may be overcharged.
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