Nope, it wasn't the right connector. Had one that I was able to kludge onto the HPA valve cap.
The regulator puts out about 850 psi, so I carefully charged up the new Refco manifold to 200 psi.
The low side reads 200 and the high side shows 210.. 5% accurate?
It's been hanging in there for half an hour, so there's no fast leaks anyways.
Edit:
Ebay had NYLOG GASKET THREAD SEALANT & ASSEMBLY LUBE RT201B
It's in route. Should be here by the middle of next week..
Edit: Oct 22, Nylog came in today. It's gooey