OK, gauges have been ordered and are en route.
I put the AC on with the car in the garage and shot this video. It is difficult to shoot in there!
https://www.youtube.com/watch?v=2ui7-KtopyE
I couldn't quite tell if the outer was turning. There was definitely an a portion of the bore I could tell wasn't turning.
I left it on for about 5 minutes, which never engaged the secondary electric fan. Also after 5 minutes, I felt both of the lines, but neither of them was appreciably colder. Is the suction the line that goes from the low side fill port to the compressor?