How to access the Pressure Gauge 1. Remove the water tank cover and remove the three screws on top of the machine. 2. Get a flat screw driver and lift up the tab. 3. Pull the gauge unit out and make sure all the wires are connected properly 4. Remove the brass nut that is connected to pressure gauge. 5. Close up of brass nut. Remove the brass nut 6. Press the tab on both sides to release the pressure gauge.