FEATURES:X-Series Wideband UEGO AFR Controller Gauge were fastest responding wideband airfuel 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 vehiclesystem 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 bezelwhite gauge option sold separately, PN 30-0300-ACC)Locking connectors