yeah, theres no reason to not run the pressure switch....i have a p-switch...and a toggle switch for power to the compressor. So if the compressor switch is on whenever the tank pressure drops the comp. automatically comes on...if this happens at a drive through (by the way wendys 99 texas double ownz, best fast food burger you can get...for a buck) i just flip the toggle switch to shut off the power to the comp. Very helpful for itersections or places you dont want attention...also, with a p-switch...the compresser will shutt off automatically when the p-switch is satisfied....that way you dont have to guess what the tank pressure is...and you dont risk blowin your little 200$ comp up...
i wouldnt half ass it ...its a few more bucks and a few more wires..definately worth it.