Wideband Air/Fuel Ratio Gauge is Essential for Tuning & Mapping Out the Air to Fuel Ratios of Your Performance Vehicle For 4.9 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 and can be remotely mounted virtually anywhere 52mm (2-1/16inch) gauge housing 0-5V analog output 10-20 AFR range only Name:Wideband Air/Fuel Ratio Gauge Interchange Part Number:Wide Band Ratio AFR Gauge Kit Applicable models:12V gasoline vehicles Item:12V Digital Wideband Air/Fuel Gauge Colour:As Shown Material:Plastic+Metal Package Contents: 1 set * 30-4110 Fuel Ratio Wide band UEGO (as shown) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.