AEM's X-Series Wideband UEGO Air/Fuel Ratio Sensor Controller Gauges are built upon unique, patent-pending X-Digital technology that makes them the fastest responding wideband air/fuel ratio controllers in independent testing against 17 other wideband UEGO air/fuel controllers. The XSeries Wideband UEGO AFR Sensor Controller Gauge PN 300300 features a modern, visually striking faceplate and new sevensegment center display that is 87 larger than the 304110 AEM The gauge includes a 05v and RS232 Serial Port output for feedback control and data logging, and an AEMnet CANbus output for data logging XDigital wideband technology gives these controllers the ability to read and report values that other controllers do not, which can deliver more optimized engine tuning and a safer overall operating condition Faster response time improves wideband feedback control, and can provide a safer, more powerful and accurate tune When tuning an engine using wideband AFR feedback control on an inertia dyno, dead time affects the data you are looking at because it is reported in a different operating location than when it actually occurred