Yep, that's the one I thought it might be Keith. It's one designed originally for art studio use, heavy duty continuous running. And that is a pressure regulator, on top of the gauge, so you can adjust for some really fine line, low pressure work if needed, with the right airbrush. Nice one mate.
Note, if it hasn't been used for awhile, run it for about five to ten minutes, then fire air through your 'brush, just to 'exercise' the piston and valves etc. Then just practice, maybe with inks or watercolour paints, on card or paper, to get the feel of the 'brush and the different pressure settings of the compressor. Those cheap bottles of liquid primary colour paints at kiddies toy shops are ideal for practice, thinned about 50/50, and clean up can be done with water.