Gas gauge not working? I think I fixed it.

This is my setup for pressurizing tanks. I start by turning the regulator to it's lowest setting, then open the valve on the left and slowly crank up the pressure on the regulator. the valve on the right is used for a little extra safety to bleed off pressure if need be. I go real slow and tap on the tank with a rubber mallet in the damaged area like Redfish said. You need a lot less pressure than you think and you can blow one up with unregulated shop air.