Cheif, you can oder a hobby regulator at www.dixieart.com, complete with moisture trap. Or you can do what I did, Hobby Lobby has the testors pressure gauge by itself (1psi increments from 0 to 60 psi), just unscrew your gauge on your regulator now then put some teflon tape on the threads of the new one and screw it on and you are set!!! I think Michaels art supply stores have them too.
If you dont have either just order the complete one from dixie art... it's possible to use the industrial one but it's hard to get your pressure at lower pressures. Thats why I changed to this one shortly after getting the compressor!
Good luck!