This is a personal favorite! AEM Digital Wideband UEGO Gauge: A wideband UEGO sensor controller accurately monitors Air/Fuel ratios (AFR) during the tuning process to prevent a lean fuel mixture, which could lead to engine damage. AEM has combined its single-channel wideband UEGO controller and gauge display into one unit, uniting unsurpassed AFR accuracy and control with an easy-to-read interface. AEM�s Gauge-Type Wideband UEGO Controller features a digital LED display and sweeping LED �needle� that changes colors as AFR changes from rich to lean. The unit�s 52mm (2-1/16�) gauge housing fits in most gauge pods and can be remotely mounted virtually anywhere.

* Ideal AFR monitoring tool for EFI and carbureted applications, and engine dynamometers
* Does not oscillate AFR reading like narrow band sensors
* No laptop required for monitoring!
* Bosch sensor included
* Accurate to 0.1 AFR
* Reads in AFR or Lambda via a switch in back of gauge housing
* 24 Color-coded LED display lights provide immediate reference to engine�s air/fuel ratio (AFR) or Lambda ratio
* Integrated three-digit display reveals AFR or Lambda in real time
* User-programmable 0-5v analog output included for use with data loggers and virtually any engine management system
* Serial data stream included for output of AFR (RS 232)