Advice using Alclad II Aluminium.

Great info here: http://www.swannysmodels.com/Alclad.html

The ease with which you can add an outboard pressure guage depends on your compressor and its output fitting. If the output is quarter inch pipe thread with a reducer to small size fitting for airbrush hose, it is easy to add- just use a quarter inch T-fitting and the gauge.  If, however, it ONLY had the small fitting, you'll need to build up something with small fittings, and an adapter for the gauge.  The small sized fittings may not be available at all hardware stores.

Out of the bottle, Alclad2 is quite thin & is best sprayed at low to moderate psi.  It will vary depending on your set-up, but about 15 psi is a good starting point for experimentation.  If your compressor does not have a pressure regulator, it would be wise to add one.

Regards,  Rick