GlowShift Tinted Series Wideband Air/Fuel Ratio AFR Gauge Kit - Includes Oxygen Sensor & Weld-In Bung - Blue Digital LED Display - Smoked Lens - 2-1/16" 52mm 2 1/16th Inch (52mm) Black Face with Magnified Tinted Lens Blue Digital Numeric Display Reads from 10.0 to 20.0 AFR and is Accurate to One Decimal Place with 3 Color LED Ring that Indicates Lean, Rich, and Optimal Air/Fuel Mixture Digital 12 Volt Wideband Contoller Unit Bosch LSU 4.9 Wideband Oxygen Sensor with Weld -In Sensor Bung Free Lifetime Technical Support & One Year Limited Warranty