When it comes to using nitrous, consistency is key. The more stable you can keep your bottle pressure the more consistent your car will run!The brand new Nitrous Express Pressure Gauge lets you set and maintain a target nitrous pressure by automatically turning your NX bottle heater on/off without ever leaving the driver's seat.The Nitrous Express Pressure Gauge features a 5-psi buffer zone below the target pressure to prevent rapid fluctuations of the heater relay.