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Another trip under the truck had me dismounting one side of the air storage tank so I could rotate it down and install the pressure switch into the threaded bung on the topside of the tank. In both the foreground and background you can see the 90-degree air line fittings. One is air in from the compressor and one out to the air supply side of the solenoid block. It’s important to note that thread sealer must be used on each threaded connection to ensure against slow air leaks.