Be sure to read the instructions that came with your board. Connect the air hose to the “outer” side of the pump. Locate the air valve at the back of the board and make sure that the air valve needle is in the up position before inflating. Insert the other end of the hose into the high-pressure air valve and screw it clockwise into the high-pressure air valve. Inflate the circuit board to 12-15 PSI. The barometer will not register until you reach 7-8 PSI. After fully inflating, carefully twist the pump hose counterclockwise. Replace the bonnet on the air valve.