AEM X-Series OBDII Digital Datastream GaugeAEM X Series OBDII Gauge. Black Bezel & Black Faceplate AEMs X Series OBDII gauge (PN 30 0311) puts multiple channels of data at your fingertips by reading the CAN bus stream of your vehicles OBD port and transmitting those channels to the gauge display. It reads Diagnostic Trouble Codes (DTCs) and gives you the ability to clear codes. Wiring is as simple as connecting the gauge to your vehicles OBDII port using the supplied connector! Because the X