All the required connectors eventually arrived, duly fitted and the beast was fired up. Blimey, it can be quite daunting not to mention a tad scary! Firstly, as has been said, these things are quite noisy and you get quite a shock when you first fire one up. I also tested the safety valve as advised to do so and it nearly took my face off! Anyway, all was to the script and equipped with my air tool I blasted out a very dusty, dirty hifi receiver. Jesus, this thing has power in buckets, talk about remove dust? it can lift paint! (well almost). I did notice that when used continuously, or nearly, the reservoir pressure and hence the output pressure drops as a result, although not in any way problematic for my purposes.
Thanks for the advice and guidance everyone who contributed to this thread.