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Thanks for posting
It sounds like the system was converted to the R134 freon a while back which means the service ports look different than the old ones, the low pressure port is always on the bigger a/c line, this should be somewhere between the a/c compressor and the firewall, most likely close to the firewall. I'll see if I still have a picture if you can't locate it. Let me know.
I have taken a couple of photos just now of what i believe is likely the low pressure port in question. Perhaps you can confirm i have it correct. It appears to have a black screw cap on the port. If i am correct and this is the port i'm looking for, do i simply unscrew the cap and attach the hose from the AC PRO canister?
I did not get a response to my reply to your answer. It included 2 photos and a question.