AEM UEGO Wideband Air/Fuel Ratio Gauge 52mm (Bosch 4.9 LSU) — LED Readout, 0-5V Output

The AEM 30-4110 UEGO is a compact, 52mm digital wideband air/fuel ratio (AFR) gauge with a Bosch 4.9 LSU sensor that displays fast, accurate AFR data via LED readout and 0-5V analog output.

This AEM wideband gauge provides real-time air/fuel ratio monitoring for performance and safety tuning. It combines a bright LED numerical display with a sweeping color-change LED needle so you can see AFR at a glance, while supplying a 0–5V output for data loggers and engine management systems. Included are interchangeable bezels and faceplates so the gauge can match your dash or pod, and the Bosch 4.9 LSU sensor offers improved warm-up time and stable readings without requiring free-air calibration.

How quickly and accurately does this gauge report AFR changes?

The AEM 30-4110 uses the Bosch 4.9 LSU wideband sensor and a dedicated UEGO controller to detect small AFR shifts fast. It reports changes precisely enough to detect 0.1 AFR differences, giving tuners immediate feedback during adjustments or under load.

• Bosch 4.9 LSU sensor for faster light-off and stable readings.
• Digital LED numeric readout plus sweeping LED needle for instant visual feedback.
• Detects 0.1 AFR changes for precise tuning.
• No free-air calibration required when used with AEM gauge.

What installation and connectivity options does the gauge offer?

The gauge ships with two harnesses: a longer harness for the UEGO sensor and a shorter harness with four wires for power, ground and outputs. Its 52mm (2-1/16") housing fits most standard gauge pods or can be remotely mounted, and the 0–5V analog output integrates with many aftermarket ECUs and data logging systems.

• 52mm housing fits common pods and remote installs.
• Two harnesses included: sensor harness and short four-lead harness.
• 0–5V analog output compatible with most engine management systems.
• Weld-in bung and Bosch sensor included (PN 30-4110).

How customizable is the gauge’s appearance for dash integration?

AEM includes interchangeable black and white faceplates plus black and silver bezels so you can match the gauge to your dash or pod theme. The faceplates allow for different visual contrast and the bezels change the outer trim, creating several distinct looks from one unit.

• Black and white faceplates included for contrast options.
• Black and silver bezels included for different trim finishes.
• Compact 52mm size for conservative or cluster installs.
• LED needle color changes provide instant AFR context without reading numbers.

What sensor differences should I know compared to older AEM models?

The 30-4110 uses the Bosch 4.9 LSU sensor which lights off faster and draws less current than older 4.2 LSU sensors. The connector and sensor are not interchangeable with the older 30-4100 controller, so use the supplied 4.9 sensor and harness designed for this gauge.

• Bosch 4.9 LSU sensor included; improved warm-up and stability.
• Different connector than older 4.2 LSU sensors—do not swap sensors between controllers.
• Same fuel compatibility as previous sensors; designed for wideband AFR use.
• No free-air calibration required when used with this AEM gauge.

Who is this for? The AEM 30-4110 UEGO Air/Fuel Ratio Gauge is aimed at vehicle owners, hobbyist tuners and professional shops who need a compact, accurate wideband AFR display with data output. It suits street, track and turbo or high-performance applications where monitoring AFR precisely matters during tuning and high-load operation. If you want a small-footprint gauge that ties into logging or an aftermarket ECU while offering quick visual cues and customization, this AEM unit is designed for that role.