The G2 Air-Fuel Ratio gauge - 52mm - 2.0625in - features a high-speed stepper motor through-dial backlighting and an illuminated pointer. Each kit includes the gauge an LC-1 wideband controller oxygen sensor and bung-plug and the award-winning LogWorks engine-tuning software. Features a Silver face and Silver bezel Air-Fuel Ratio Range is 8 to 18 - Wide range Auto calibration capability to compensate for changes in temperature - altitude - and sensor condition