AEM X-Series Wideband UEGO AFR Sensor Controller Gauge

A Wide-Band Air Fuel Ratio Gauge is an absolute must for safe and proper tuning.  On older cars prior to CAN Bus systems, the AEM 30-0300 package is what you would want.  If you are only tuning 2007+ CAN Bus equipped cars, this is the AEM Wide-Band you would want 03-0334 version.

X-Series Wideband UEGO AFR Sensor Controller Gauge with patented X-Digital Technology, Includes X-Series Wideband Controller Gauge, Bosch LSU 4.9 Sensor, Wiring Harnesses, Black Bezel, Reversible Black AFR-Lambda Faceplate, O2 Sensor Bung