Hello,

I had the same issue, so I installed a Robart in line connector to my air pressure guage. Works great, just disconnect and reconnect. This valve does not leak, is sealed with o-rings. Sorry I don't have the part number. One side of the connector is brass/bronze with a six sided body for a small wrench, if necessary. The other side is composed of an aluminum knurled knob which rotates about the brass/bronze insert, so the air line doesn't have to rotate and kink up on connecting/disconnecting.
Good luck!

Skeet