Dead pirate: first, verify no non running air leaks. Second, with engine running check : air dryer purge port, then check the line from the compressor to the tanks I've seen them get loose or rubbed s hole in and eventually no air pressure situation. Failing these two areas, check the air governor pub removing the line to the unloading valve on the compressor head may need to plug it. If that isn't causing trouble, its internal in compressor with head/ unloaded valve is bad or rings are broken might also be showing excessive blowby tube air ( tube that comes of the valve cover vents to atmosphere below the engine) don't know if the head can be serviced separately. Let us know but I'd check the outlet of the compressor too before changing it just plumb a hose to a tank with a gauge and see what you get.
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