It's a good thing #1 didn't want to come loose then.
So, on to the test results. I've got a vacuum gauge hooked up tee'd off at the modulator end and a mechanical oil pressure gauge plugged into the take-off port. I ran the car for 5 minutes in a 90° garage to make sure the choke kicked down, and it wouldn't go any lower, but the idle might still be a hair high. I don't have a tach so I don't have solid numbers there. I just wanted to mention it to be thorough.
So here's what we've got:
Time | Transmission PSI | Vacuum inHg | Gear
1605 | 65PSI | 19.5" | P * Choke on, fast idle
1607 | 60PSI | 18" | P
1610 | 60PSI | 18" | P
1611 | > 100 | ?? | R * Gauge only goes to 100
1611 | 65PSI | 18" | P
1611 | 65PSI | 18" | N
1611 | 70PSI | 14" | 2
1611 | 95PSI | 14" | 1
1612 | 75PSI | 14" | D
1612 | 65PSI | 18" | P
So it's definitely got pressure in every gear. The vacuum drops when I stick it in gear since the engine's struggling against me standing on the brakes. I missed the vacuum reading in Reverse while I was quickly taking it back out of gear since it had more pressure than my gauge can show.
The only thing that seemed odd to me was that I was getting 60PSI in Park until I tried Reverse and after that I kept getting 65. I don't know if that's significant or if I just broke the gauge, but it's the only thing that jumps out to me.
Do these numbers mean anything to anybody?