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Best air fuel ratios - April 2026

Last Updated - April 3, 2026

1
Best Choice

✖
Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

Innovate Motorsports

Innovate Motorsports (3837) LM-2 (BASIC) Digital Air/Fuel Ratio Wideband Meter incl. Bosch LSU 4.9 , Black

Innovate Motorsports

$480.66

More Details
Main highlights
- includes the LM-2, Bosch LSU 4.9, 8 ft sensor cable, cigarette-lighter power, USB cable, weld-in bung and plug, and quick-start guide.
- Wideband O2 sensor (Bosch LSU 4.9) is compatible with most fuel types (leaded, unleaded, diesel, methanol, E85, etc)
- Positive lock connectors for all connections
- Patented “Direct Digital” Wideband Technology
$480.66
2

✖
Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

AUTO METER

Auto Meter 4379 Ultra-Lite Wide Band Air Fuel Ratio Kit,2.3125 in.

AUTO METER

$228.59

More Details
Main highlights
- Suitable for use with gasoline powered engines
- Gauge kit includes custom tuned .1 AFR Resolution Bosch LSU4.2 Sensor, 8ft. wiring harness, 304 stainless steel weld-in bung, mounting hardware, and detailed instructions for installation
- Digital segment display and LED radial bar graph display
- 12 and 16 volt compatible, compatible with nearly every street car or race car electrical system
- 0-4v data output feed for ECU, data acquisition unit, or Laptop tuning
$228.59
3
Best Value
10% Off

✖
Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

AEM
10% Off

AEM 30-0300 X-Series Wideband UEGO AFR Sensor Controller Gauge

AEM

$200.65

$222.95
(10% Off)

More Details
Main highlights
- X-Digital wideband technology gives these controllers the ability to read and report values that other controllers do not, which can deliver more optimized engine tuning and a safer overall operating condition
- When tuning an engine using wideband AFR feedback control on an inertia dyno, dead time affects the data you are looking at because it is reported in a different operating location than when it actually occurred
- The gauge includes a 0-5v and RS232 Serial Port output for feedback control and data logging, and an AEMnet (CANbus) output for data logging
- The X-Series wideband UEGO AFR sensor controller gauge (PN 30-0300) features a modern, visually striking faceplate and new seven-segment, center display that is 87% larger than the 30-4110 AEM
- Faster response time improves wideband feedback control, and can provide a safer, more powerful and accurate tune
$200.65
$222.95 (10% Off)
4

✖
Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

AEM

AEM (30-4110) UEGO Air/Fuel Ratio Gauge

AEM

$184.45

More Details
Main highlights
- No free air sensor calibration required ever. A 2-1/16 inch gauge housing ensures that it will fit in most gauge pods and can be remotely mounted virtually anywhere
- Interchangeable black and white faceplates included for customizing gauge appearance.Material:Plastic
- Interchangeable black and silver bezels included. 52mm (2-1/16”) gauge housing
- Bosch 4.9 LSU wideband sensor and weld-in bung included PN 30-4110
- 0-5V analog output 10-20 AFR range only
$184.45
5

✖
Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

JJCOCO

JJCOCO Wideband UEGO Air/Fuel Ratio AFR Gauge Kit 0-5V Analog Output with LSU 4.9 O2 Sensor Digital LED Display AFR/Lambda Controller Gauges 52mm (2-1/16”)

JJCOCO

$109.99

More Details
Main highlights
- Versatile Data Output for Logging & Connectivity: Unlock advanced tuning with dual 0-5V analog and RS-232 serial outputs. Easily connect to data loggers, ECUs, or tuning software to record and analyze performance. This feature makes the O2 sensor gauge a powerful tool for both amateur and professional tuners
- Ultra-Fast & Accurate Professional Tuning: Get real-time precision with the advanced LSU 4.9 O2 UEGO sensor, delivering a lightning-fast 20ms response for unmatched accuracy. The vibrant 24-color LED display and four-digit readout provide crystal-clear, instant feedback on your air/fuel ratio, enabling perfect tuning for max performance and engine safety
- Highly Configurable Display for Your Preferences: Customize how you view data! Toggle between 3 or 4-digit precision, and choose to monitor in AFR, Lambda, or O2% values. The bright, color-coded LED ring offers intuitive visual alerts, making it easy to read your mixture status at a glance, day or night
- Effortless Installation with Dual Calibration Modes: Enjoy a true plug-and-play experience! Our JJCOCO wideband AFR gauge offers two simple calibration choices: Resistor Trim (rCAL) for pre-calibrated, no-hassle setup or Free Air (ACAL) for custom tuning. Complete with clear connectors and instructions, it’s designed for a quick, DIY install
- Broad Compatibility for Universal Use: A reliable choice for almost any vehicle! This wideband O2 sensor kit supports 12V systems, making it safe for cars, trucks, motorcycles, and race cars. Its rugged design ensures stable operation even with voltage fluctuations
$109.99

Best air fuel ratios - April 2026

Innovate Motorsports (3837) LM-2 (BASIC) Digital Air/Fuel Ratio Wideband Meter incl. Bosch LSU 4.9 , Black

Auto Meter 4379 Ultra-Lite Wide Band Air Fuel Ratio Kit,2.3125 in.

AEM 30-0300 X-Series Wideband UEGO AFR Sensor Controller Gauge

AEM (30-4110) UEGO Air/Fuel Ratio Gauge

JJCOCO Wideband UEGO Air/Fuel Ratio AFR Gauge Kit 0-5V Analog Output with LSU 4.9 O2 Sensor Digital LED Display AFR/Lambda Controller Gauges 52mm (2-1/16”)

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