FEATURES:X-Series Wideband UEGO AFR Controller Gauge were fastest responding wideband air/fuel ratio controllers in an independent test vs. 17 competitor wideband AFR controllersIncludes Bosch 4.9LSU wideband UEGO sensorFactory calibrated resistor does not require -air calibration, but technology allows for -air calibration as sensor ages if user desiresCompatible with vehicle/system voltages up to 16V0-5V & RS232 output for data logging and feedback control, AEMnet (CANbus) for data logging and daisy-chaining multiple controllers up to 16 cylindersCan display AFR values in hundredths of %52mm gauge diameter and slim 0.825 gauge depthGauge cup depth only .200 deep!Auto dimming featureUser configurable display via buttons on the gauge face for changing AFR values, Lambda and O2%, and 3- or 4-digit displayBlack bezel and black dual faced faceplate included (gauge only, silver bezel/white gauge option sold separately, PN 30-0300-ACC)Locking connectors