Innovate Motorsports 3893 PSN-1 PowerSafe Nitrous Bottle Pressure/Wideband Oxygen Gauge Kit All-in-one, Nitrous safety override and wideband air/fuel ratio gauge w/RPM window switch, 52mm (2 1/6") diameter gauge body OLED user configurable display. Nitrous Bottle Press., shift light, Air/Fuel ratio. AFR or Lambda, inHg, PSI, kPa, or BAR 1500 PSI nitrous bottle pressure sensor User programmable nitrous safety cut using Air/Fuel ratio and bottle pressure references. Nitrous cut by lean air/fuel condition. Nitrous cut by minimum bottle pressure User programmable RPM window switch range, 10 RPM increments