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Auto Meter 7178 C2 Digital Wideband Air/Fuel Ratio (AFR) Gauge
Auto Meter 7178 C2 Digital Wideband Air/Fuel Ratio (AFR) Gauge

Auto Meter 7178 C2 Digital Wideband Air/Fuel Ratio (AFR) Gauge

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Auto Meter 7178 C2 Digital Wideband Air/Fuel Ratio (AFR) Gauge
Auto Meter 7178 C2 Digital Wideband Air/Fuel Ratio (AFR) Gauge
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We estimate this item will ship on or before April 5th.
Part # 1827178
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Important Messages:

  • This item ships directly from the manufacturer. It may take an additional 10 business days for Auto Meter to ship this item.
  • Get FREE shipping when your order includes this item and exceeds $99! Ground shipping only in the contiguous US.
  • This item ships via Ground Shipping only. Expedited and Air shipping options are not available.


MFG. Part #:
Overall Diameter:
Sold in Quantity:
Gauge Type:
Gauge Range:
6:1-20:1 AFR
Gauge Face Color:
Bezel Finish:
Bright Anodized
Sending Unit Included:
Lighting Type:
Digital LED
AFR Gauge Type:
Includes Wire Harness:
Includes Mounting Bracket(s):
GTIN Code:


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. Auto Meter 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 Auto Meter 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.
  • Includes 8ft. Wiring Harness
  • Includes custom tuned .1 AFR Resolution Bosch LSU4.2 Sensor
  • 0-4v data output feed for ECU, data acquisition unit, or Laptop tuning
  • User programmable range
  • Peak recall/memory
  • 10:1 to 20:1 AFR Range for Gasoline Applications
  • Adjustable for Alternate Fuel Types (Ethanol, Methanol, Propane, CNG) 6:1 to 18:1 AFR Range for Alternate Fuel Types
  • User Programmable Warning Function
  • Display data in Lambda or numerical A/F ratio

Installation Instructions (PDF)

Some parts are not legal for use in California or other states with similar laws/regulations

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