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Built upon unique patented 100% Digital technology that makes them the fastest responding wideband air/fuel ratio controllers in independent testing. The X-Series Wideband UEGO AFR Gauge has a user configurable display via buttons on the gauge face that allow you to change AFR values for different fuels Lambda or O2% change the center display to three or four digits perform a free-air calibration if desired as the sensor ages and change the CAN message ID when linking multiple X-Series Inline Controllers or X-Series Controller Gauges.