If you start putting mods on your motor, then you can change the fuel demands of the engine across the rpm band. On top of that, fuel demands can change due to outside factors, such as altitude or air supply. When we made the decision to throw nitrous on our daily driver, we knew we should keep tabs on our engine to make sure it wasn't running lean (it was a fat chance we were going to run our engine rich while on nitrous.) AEM's Gauge-Type Wideband UEGO (universal exhaust gas oxygen) Controller can be instrumental in engine tuning and also make a good tool for everyday driving with a modified engine.
AEM has a full line of gauges besides the UEGO gauge. All of AEM's gauges are completely digital and have changeable faces. | 
Special projects chief Greg Nakano shoved both of our 2-1/16-inch gauges into a dual-gauge pod that we would mount on our pillar. The AEM gauges come with backing plates, but the fit in the gauge pod was so tight that it was unnecessary. Since we had a dual-gauge pillar pod, we decided the next best gauge for us to have would be a tranny-temperature gauge. | 
Nakano mounted our gauge pod and ran the connections from there. AEM includes all the wiring harnesses necessary to complete the connection between a power source, the oxygen sensor, and the gauges. |
The wideband UEGO-gauge kit comes with a high-quality Bosch oxygen sensor that provides the UEGO gauge reading accurately within 0.1 air/fuel ratio (AFR). | 
Nakano ran the wiring harness to the oxygen sensor through our undercarriage, making sure to keep the wires away from anything moving (such as the driveshaft) or extreme heat sources (such as the exhaust). | 
What Did We Think?The gauges are fairly easy to read, and the 24 color-coded LED display lights make for a nice, easy readout. On top of that, a digital display in the middle of the gauge gives an accurate reading down to a single whole digit. |