I know this has been covered but I'm damned if I can find it! I want to use my late model (late 80's - early '90's) aircon pump for OBA. Has anyone got this set up? Does it provide enough cfm for impact guns/airing up tires? What sort of pressure switches did you use and did you use an external oiler and seperater? Alternatively.....link me to a suitable post or site Thanks.