If you are running high amounts of boost or if you are using a fuel controller, you will want to install the AEM UEGO. The AEM UEGO monitors your cars air/fuel curve. This gauge is 52mm in size.

• 24 Color-coded LED display lights provide immediate reference to engine’s air/fuel ratio (AFR) or Lambda (11.0:1 to 17.0:1)
• Integrated three-digit display reveals AFR or Lambda in real time (10.0:1 to 18.5:1)
• User-selectable 0-5v analog output included for use with data loggers and most programmable engine management systems
• NEW! Switch between AFR or Lambda readout with a twist of a switch (included face plate change is required for proper readout)
• NEW! Included black and silver bezels, black and white AFR gauge faces and black Lambda gauge face allow you to personalize the look of your gauge!
• NEW! Quick-Connect system eases installation by allowing users to mount the gauge and sensor wiring separately
• Ideal AFR monitoring tool for carbureted applications and engine dynamometers
• Does not oscillate AFR like narrow band sensors
• Serial data stream included for output of AFR (RS 232)
• Accurate to 0.1 AFR
• Bosch UEGO sensor included
• Part # 30-4100