Wideband UEGO Air Fuel Ratio Gauge Kit 2-1/16" X-series 30-0300 AFR O2 Sensor

Wideband UEGO Air Fuel Ratio Gauge Kit

This wideband UEGO air fuel ratio gauge kit provides real-time AFR readings with a 2-1/16" X-series display and an included Bosch O2 sensor, referencing gauge part 30-0300.

Overview

The wideband UEGO gauge kit delivers accurate air/fuel ratio data essential for engine tuning, forced induction setups, and performance diagnostics. With fast-responding sensor technology, this wideband gauge helps drivers monitor combustion health and prevent lean or rich conditions under load. Suited for tuners, track enthusiasts, and daily drivers seeking reliable wideband feedback.

Built For Performance

• Bosch LSU 4.9 wideband O2 sensor provides fast, stable readings from 0.68 to 1.36 lambda.
• X-Series digital gauge with sleek 2-1/16" face displays AFR and lambda simultaneously.
• Free-air calibration allows sensor to be serviced easily without special tools.
• 0-5V analog output connects to standalone ECUs or dataloggers for seamless tuning.
• LED backlight with multiple color options ensures visibility in bright or dark cockpits.
• Includes weld-in bung and wiring harness for complete installation.

On-The-Job Use

• Street and race tuning for naturally aspirated or forced induction engines.
• Dyno testing to validate air/fuel ratios and ignition mapping.
• Diagnosing lean or rich misfires and catalytic converter efficiency.
• Monitoring fueling during towing, hauling, or sustained high-load driving.
• Integrating with aftermarket ECU systems for closed-loop lambda control.

Specs At A Glance

Good To Know

Q: Is the wideband sensor compatible with pump gas and ethanol blends? A: Yes, the LSU 4.9 sensor handles unleaded gasoline, E10, and moderate ethanol blends up to E85 when properly calibrated; sustained leaded fuel use may degrade sensor life.

Q: Does this gauge require a separate controller? A: No, the X-series gauge has a built-in controller that powers and interprets the wideband sensor directly, simplifying installation with just a single harness connection.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.