TM 5-3805-254-20-1
NONELECTRIC GAGES
AIR PRESSURE GAGE
Air pressure supplied by air compressor but readings read from air reservoir. Actual pressure is applied to bourbon tube
causing it to straighten. This movement changes needle position in direct relationship to bourbon tube. Two needles are
provided. First needle indicates spring brake release pressure, second needle shows safe running air pressure.
FUEL PRESSURE GAGE
Fuel pressure supplied by hand primer pump. Actual pressure is applied to bourbon tube causing it to straighten. This
movement changes needle position in direct relationship to bourbon tube movement.
AIR CLEANER VACUUM GAGE
Vacuum supplied by engine through air cleaner element. High vacuum indicates a clogged air filter element. Low vacuum
indicates a clean air filter element.
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