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Quick Specs

  • Size:2-1/16" (52.4mm)
  • Type:Digital
  • Range:6:1-20:1 AFR
  • Lighting:Digital LED
  • Instructions: Download PDF


Knowing the exact air/fuel mixture running through your engine is the most important factor to extracting the highest levels of performance and durability. Not all wideband gauges are created equal. AutoMeter utilizes an advanced calibration method that automatically calibrates your gauge on every startup to assure you of the highest degree of accuracy over the entire lifespan of your sensor (no free air calibration is ever necessary). Compatible with nearly all fuel types, the AutoMeter Pro Wideband has a configurable display to pinpoint the exact range you want to keep an eye on. An advanced peak recall function and lean warning system make sure you’re safely making power, whether on the track or on the street. An automatically dimming display tailors light output for any condition. Data logging output is included for one wire or two wire systems in both lambda or AFR. Our specially designed O2 sensor and wiring harness are included for ease of installation. Quite simply, there isn’t a more accurate or easy to live with wideband gauge available on the market.
Feature Points
  • 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
  • 0-4v data output feed for ECU, data acquisition unit, or Laptop tuning
  • User programmable range for Rich/Stoic/Lean conditions
  • Peak recall/memory
  • 10:1 to 20:1 AFR range for gasoline applications
  • 12 and 16 volt compatible, compatible with nearly every street car or race car electrical system
  • User Programmable Warning Function
  • Display data in Lambda or numerical A/F ratio
Ships With
  • Includes Sending Unit: 2243
  • M18X1.5 Fitting and Plug
  • Wire Harness: 5232
  • 2230
California Residents: Prop 65 WARNING prop65 Cancer, Birth Defects and Reproductive Harm


Rated 2 out of 5 by from Worked for about 4 months and then stopped This is the 3rd guage in the carbon series that has stopped working on a car that does not see a lot of use. first the trans temp gauge, then the speedometer, not the AFR guage. What is going on at Autometer?! I don't know if I want to invest anymore in this product to try to fix or just get another brand. One other user says he is on his 3rd AFR guage from Autometer, they are not inexpensive, so I can't afford to guess on how to fix it.
Date published: 2021-07-29
Rated 3 out of 5 by from Questionable quality I’m on my 2nd gauge and 3rd widenand sensor in 3 years. Looks great but not real happy about the quality
Date published: 2019-03-14
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I lost my harness to my 4778 AFR gauge in a recent move is there any way i can purchase a new one?

Asked by: drangel
You would be able to purchase part 5232.
Answered by: Thomas From AutoMeter
Date published: 2022-10-06

Could I use this one with a lsu4.9 instead the 4.2?

Asked by: Ferko07
Thank you for your question. No, our Pro model AFR gauges are only compatible with the LSU 4.2. Our Pro Plus models use the LSU 4.9.
Answered by: Zach from AutoMeter
Date published: 2019-04-02

will this system work with methanol fuel systems

Asked by: Shawn85301
Hi Shawn, thank you for connecting with us. Yes, the Pro Wideband is compatible with methanol and can also be adjusted so that the range is more applicable to the 6.4:1 stoichiometric point of methanol.
Answered by: Matt from AutoMeter
Date published: 2020-07-12
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