AEM (30-4110) UEGO Air/Fuel Ratio Gauge Interchangeable black and white faceplates included for customizing gauge appearance Bosch 4.9 LSU wideband sensor and weld-in bung included PN 30-4110 No free air sensor calibration required ever. A 2-1/16 inch gauge housing ensures that it will fit in most gauge pods and can be remotely mounted virtually anywhere Interchangeable black and silver bezels included 0-5V analog output 10-20 AFR range only