York Onboard Air Compressor Diagram - 2.5 Gallon Tank, Relay & Pressure Switch

This is a color schematic titled "The Ranger Station" showing how to plumb and wire an onboard air (OBA) compressor system in a vehicle. The diagram depicts an engine-driven compressor feeding air through a one-way check valve into a 2.5 gallon air tank. The tank is fitted with a regulator with a 0-160 PSI pressure gauge, a 50-200 PSI safety valve, and lines running to two quick-connect fittings (front and rear). On the electrical side, a 0-160 PSI pressure switch mounted off the tank works with a toggle switch to control a 12-volt relay (with terminals labeled L, S, B). The relay switches power from the battery to the compressor clutch, with a green control wire running to the compressor and circuit protection routed through the vehicle's fuse panel. Air lines are shown in red/brown and yellow, and wiring in orange, red, black, and green. A reader can learn the overall layout of components, the order of plumbing (compressor → check valve → tank → regulator/quick connects), the pressure ratings of the switch, gauge, and safety valve, and how the pressure switch, toggle switch, relay, battery, and fuse panel interconnect to automate the compressor.