Just wanted to provide the resolution of this. When I took off the old compressor, there was no oil. The capacity of the PT's system is 6 oz of oil (according to the FSM). Following directions I found elsewhere, I put 3 oz in the compressor, and 3 in the accumulator. I assumed the system was dry, due to repeated leaking at a the joint for a cheap Chinese accumulator (which is now replaced).
Pulled a vacuum on the system, and charged it. System works great. Had to get this done the day before driving from Florida to NJ for my Dad's funeral, who died after a long bout with Alzheimer's. He taught me how to do most of this stuff, and was a great engineer. Hope I'm half as good of an engineer as he was.
In any case, the A/C worked great the entire trip, and continues to work great. The compressor is nice and quiet as well.