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30-0300 Wideband UGEO Air Fuel Ratio Gauge 52mm(2-1/16"), AFR/Lambda Controller Kit with LSU 4.9 Sensor

  • Based on 70 reviews
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Availability: In Stock.
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Arrives Wednesday, Jul 1
Order within 21 hours and 55 minutes
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Features

  • What A Easy Helper! Featuring sweeping 24-color-coded LED display and four-digit central readout, the faceplate of wideband gauge is two-sided and reversible. Thanks to it, the afr gauge can switch between 3 display modes of air-fuel-ratio, lambda, oxygen percentage at will, by that means you are able to effectively but quickly monitor your vehicle's conditions.
  • Core Technology To maximize your engine's power while stay safe, an air fuel ratio gauge kit is must-have! The Gledewen AFR gauge helps to identify sensitively every slight fluctuations of air-fuel ratio and report precise and reliable reference to the car engine in real-time, and in particular it matches with LSU4.9 UEGO, ensuring its faster and more precise response(20ms typical).
  • TWO Calibration ModesResistor Trim Mode(rCAL) or Free Air Mode(ACAL)? It is up to you! The supplied UEGO sensor is factory calibrated via a trim resistor, integral to the sensor connector, and rCAL is the recommended calibration mode for best accuracy, for most users, there is no further action or calibration required.
  • Installation InstructionsMount the 52mm gauge, connect power and ground wires, and install the LSU 4.9 sensor into the exhaust bung for quick setup.
  • 12-MONTH WARRANTYIf the wideband AFR sensor controller gauge kit fails, stops working or any other problems, you can rely on our service of carefree REPLACEMENT or REFUND

Description

The UEGO gauge will indicate changes in the air/fuel ratio in real time, which is essential when you aim to perform safer, more powerful and accurate engine tuning.Specifications:52mm(2-1/16") Diameter MountingCompatible with Vehicle/System Voltages up to 16V0-5V Analog OutputSerial RS-232 Output20ms Typical Response8.0:1 to 20.0:1 AFR / 0.55 to 2.00 LambdaConfigurable 3 or 4 Digit Precision Display ModesConfigurable AFR, Lambda or O2% Display ModesFree Air or Resistor Trim Calibration ModesAuto Dimming FeatureGledewen Wideband UEGO Air Fuel Ratio Gauge Kit Includes:1 UEGO Gauge1 Wideband Oxygen Sensor1 PWR/IO Cable1 Sensor Harness4 Butt Connectors1 Silver Nut1 Installation InstructionUsage Steps1. Connect Harness A to Port A.2. Connect Harness B to Port B.3. Connect the other end of Harness B to the sensor.4. The other end of Harness A has a red wire for the positive terminal and a black wire for the negative terminal.5. Connect to a 12V power supply. The instrument will start working, with a working voltage of 12V.6. The dashboard has a setting and selection button, allowing for 8 function switches.7. In the 4-digit mode, press the left button to switch to the 3-digit mode. Press the select button to confirm, which will change to 3-digit mode. Keep pressing to switch to the initialization mode or air-fuel ratio mode.8. Change to CAN mode for engine combustion ratio calibration and adjustment. This can increase the combustion ratio and improve engine efficiency.

Brand: Gledewen


Item dimensions L x W x H: 5.32 x 5.32 x 5.32 inches


Material: Ceramic, Stainless Steel


Item Weight: 1.2 Pounds


Style: Modern


Maximum Supply Voltage: 16 Volts (DC)


Measurement Accuracy: ±1%


Measuring Range: 0.55 to 2.00 Lambda


Mounting Type: Flange Mount


Output Type: Analog


Response Time: 20 Milliseconds


Specific Uses For Product: vehicle and engine performance optimization


Smart Home Compatibility: Not Smart Home Compatible


Material Type: Ceramic, Stainless Steel


Style Name: Modern


Brand Name: Gledewen


Model: A1417


Manufacturer: Gledewen


Part Number: A1417


Included Components: Air Fuel Ratio Lambda Gauge, Wideband LSU 4.9 O2 Oxygen Sensor


Item Dimensions: 5.32 x 5.32 x 5.32 inches


Item Weight: 1.2 Pounds


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Wednesday, Jul 1

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Top Amazon Reviews


  • Seems accurate and reliable!
I installed the 30-0300 Wideband UEGO Air Fuel Ratio Gauge 52mm (2-1/16") AFR/Lambda Controller Kit with LSU 4.9 Sensor on my 1996 Honda Civic, and it has been a great upgrade for monitoring air/fuel ratios. The gauge is bright, easy to read, and responds quickly, which makes it very helpful for tuning and keeping an eye on engine performance. The Bosch LSU 4.9 sensor seems accurate and reliable, and I like that the gauge can display AFR, lambda, or oxygen percentage depending on what you want to monitor. Installation was fairly straightforward as long as you have a good location for the sensor and a plan for wiring. Once everything was installed, it worked well and gave me much more confidence when checking how the engine was running. Overall, this kit offers solid performance, useful features, and good value—especially for anyone upgrading or tuning an older Honda like a 1996 Civic. ... show more
Reviewed in the United States on May 13, 2026 by D&E

  • Works fantastic, @ half the price of AEM
I've used it a few hours since purchase. It works fantastic, as you'd expect. I additionally have a AEM brand, this knock-off one seems to be as responsive as AEM. This one physically looks a little less sophisticated as AEM... but it's well appreciated for half the price. Time will tell, but at this time, I'm VERY satisfied/ happy with it. ... show more
Reviewed in the United States on May 1, 2026 by rod austin

  • Works great, good bang for the buck! Works great, good bang for the buck!
Worked great…. I just used it to tune my kids four wheeler, it gave me accurate air/fuel readings, and honestly works great for a $100 gauge.
Reviewed in the United States on June 9, 2026 Reviewed in the United States on June 9, 2026 by steve

  • Afr gauge
Worked great
Reviewed in the United States on December 4, 2025 by Shane

  • Waste of time and money
It's a garbage product. I installed the sensor and wired up the gauge and it doesn't work at all, the gauge jumps around for about 10 seconds then bottoms out at it's lowest reading of 8.01. The buttons on the gauge face are cheap and most of the time don't actually do anything when you press them, tried wiring it into my HP Tuner with a Pro-Link cable and there is no voltage signal. Thought maybe I got a dud and returned it and got a replacement, hooked it all up and this one doesn't work either. I'll get my money back from Amazon but the waste of time and effort is frustrating. Don't be me, buy from a reputable company who makes a functional product. ... show more
Reviewed in the United States on January 4, 2025 by Kaphs_kcin93

  • Good quality
Awesome gauge for the money
Reviewed in the United States on March 26, 2026 by Steve O.

  • Works great
I bought this for my 1930 Model A hotrod, I wanted to make sure that my Holley carburetor was tuned properly and not running too lean or rich, which is not good for the engine. The install was easy, and I mounted it on the steering column so I could read it without distraction. Everything in the product description was correct, and so far, it's been functioning perfectly. The price point was within my budget, and it works just as well as higher priced units. I would recommend this AFR gauge to anyone who wants to tune their engine the easy way. ... show more
Reviewed in the United States on December 4, 2024 by Steve M.

  • Great quality for a much lower price.
I bought this to tune a carb. I expected poor quality and planned on removing it when done. It works and looks great and I have left it in my car.
Reviewed in the United States on November 19, 2025 by Just A Guy

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