PSB-1: PowerSafe Boost & Air/Fuel Ratio Gauge (For use with or without boost cut feature. Includes: Bosch LSU 4.9 sensor)   PSB-1: PowerSafe Boost & Air/Fuel Ratio Gauge (For use with or without boost cut feature. Includes: Bosch LSU 4.9 sensor)   The PowerSafe gauges combine our patented DirectDigitalO2 sensor control technology with application specific sensors, an OLED display, and a smart safety override circuit for your high performance vehicle. Our PowerSafe technology can disable your factory or aftermarket boost control solenoid forcing the system to spring pressure. In nitrous applications, our PowerSafe technology will disable your nitrous solenoid to keep your engine safe. The PowerSafe gauges offer the looks, safety and performance enthusiasts demand! All-in-one, boost safety override and wideband air/fuel ratio gauge 52mm (2 1/6) diameter gauge body Interchangeable faceplates and bezels: Black and silver bezel, black and white faceplates included No PC required for con