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4. AIR TANK PRESSURE GAUGE: The tank pressure gauge provides a reading of the air pressure inside of the compressor tank. 5. PRESSURE REGULATOR: The regulator allows you to select the amount of air pressure that is output through the air hose into tools and accessories. Turn the pressure regulator knob clockwise to increase discharge pressure, and counter clockwise to decrease discharge pressure. Please refer to the air delivery requirements of your tools for the proper pressure settings. NOTICE