Its been fun but its all but over now since soccer started yesterday :'( .
You can use anything with 80psi of pressure to engage ARB's, could be a CO2 tank, just a regular old air tank, any electric compressor, or my favorite, the Volvo/AMC/Ford York compressor with tank setup. You don't really need a tank, but its a good idea to go ahead and incorporate it. Read the tech articles on the install, should be a lot of fun. You could do something as simple as a york with just a quick disconnect fitting on the output for filling tires, or one with pressure switches, in cab guage, and a tank and manifold.
Read all the tech articles, and then ask away if you have anymore questions, I have a general knowledge of the install, and Brad has actually done it.