The AEM X-Series Wideband UEGO Air/Fuel Ratio Sensor Controller Gauges have patent pending X-digital technology that makes them the fastest responding wideband air/fuel ratio controller in independent testing against 17 other wideband UEGO controllers. This OBDII version provides tuners who are using piggyback tuning modules or open source software with the ability to view AFR through the factory CAN-bus stream that is output by the factory ECU, and deliver the most accurate, safe and powerful tune. The Gauge is validated to work with EFILive, HPTuners and DashDaq software.Patented technology makes this the fastest responding AFR controllerIncludes a highly accurate Bosch 4.9LSU sensorDisplays AFR values in hundredths of a %User configurable display via button on the gaugeOptional 0-5V and RS232 outputs for data logging and feedback controlThe X Series Wideband UEGO AFR Sensor measure 52mm in diameter and has a slim depth less than one inch with an ultra slim cup of .200 inches increas