Air pressure is the number one performance factor in a paintball gun's operation. Gauges are a must if you want to tweak your gun to the max. Gauges can be added on tanks, drop forwards, regulators, expansion chambers or even the guns receiver if the model allows. They help monitor tank pressure and gun input pressure. Most guns, especially low pressure, are sensitive to pressure changes making an input gauge a must. Optimize your set-up and stay on top of every operational factor.