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i presume the "alert" is basically a pressure guage. All automotive AC systems are speced to hold refrigerant by weight, I am pretty sure the boxster calls for 30 ounces. If you dont know know how much was in there to begin with, and how would you, then short of venting the system, drawing a vacuum and then refilling then its pretty hard to know. If you can get a portable temperature measuring tool, often used in food cooking, and stick it in the vent then you will get anywhere from 42-45 DegF on the vent exit with a full charge. Be careful not to introduce air when you are connecting to the system as the air will royally screw things up
good luck
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