The Wideband allows you to control, and accurately monitor your Air/ Ratio as a quality, and cost effective tuning tool. The AFR gauge monitoring tool provides accurate data that is essential to a safe and powerful tune. The 30-4110 wideband gauge is easy to read, highly accurate, and controls its data by a digital LED display and LED needle that change colors as the ratios change from rich to lean. Wideband Air/ Ratio Gauge is Essential for Tuning & Mapping Out the Air to Ratios of Your Performance Vehicle. For 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 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/ Ratio Gauge Interchange Part Number:Wide Band Ratio AFR Gauge Kit Condition: Fitment Type:Direct Replacement Install Applicable models:12V gasoline vehicles Colour:As Shown Material:Plastic+Metal Package Contents: 1 set * 30-4110 Ratio Gauge Wide band UEGO 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.