A good 3/4 HP 4 gallon air compressor is suitable to run a combination of pneumatic systems.
As you can see in this picture I have both a 400,000 RPM rotary and a Lindsay AirGraver, each with its own regulator ganged together to support the different air pressures needed.
All of the air fittings, hoses, and regulators are available at most well equipped hardware stores such as harbor Freight, ACE, etc. I didn't find any reasonably priced regulators at Home Deport or Loews. Both Home Deport and Loews have a good assortment of small diameter pressure hose.
Here's the
restoration project for an old shotgun that will be engraved later.