I'm only saying this as a friend.
1) I'd only use fittings and gauges designed for the pressure of the vessel as they can see 6000 PSI if one is not attentive. I know you did say keep an eye on it, but I would be careful about telling others they don't need to have the proper fittings, simply because things do happen and a failure could occur.
2) For your or my "legal" health, I'd also never recommend less than the rating necessary for any tank. If an an accident of failure were to occur, someone could run with this information and say "he SAID I can use these kind of fittings". While the poster is a "good guy", it need not be him/her that causes trouble, anyone cruising the forum who isn't even a member could read it and cause trouble.
Just some immediate thoughts that came to my head.
Best to you,
Joe Brancato
http://www.hamcontact.com/airgun/HoseAssembly/
