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This item is available as a Blem/Refurb. These are items that cannot be sold as "New" merchandise and are limited to stock on hand. See the product details for a description of the product's condition.

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Koso Air/Fuel Gauge

Keep an eye on (and record!) your air fuel ratio and RPM with the Air/Fuel Gauge from Koso.


  • Features air fuel ratio reading, RPM and playback ability to optimize your rides performance
  • The large digits and bright back light makes it easy to read at anytime
  • Easy to operate, compact and lightweight and can be mounted to many applications
  • Automatically activates the heated screen to increase display reaction time in cold weather (14°-140°F)
  • Requires a 12V DC battery
  • Includes LSU 4.9 sensor
  • Can be mounted to many applications including snowmobiles, UTVs and more
  • Compatible with 2 stroke or 4 stroke engines; O2 sensor Bung Adapter is optional when used on a 2 stroke application - sold separately
  • Records: number of records - 50 sessions; recording time approximately 3.18 hours
  • Digital volt meter ranges DC 5 ~ 24 V; flashing numbers settable range DC 8V to DC 18V
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Fitment Notes & Exceptions
This is a universal fit part; it may or may not fit without modification.
Product Style Item # Store SKU Manufacturer Product # Availability
Product Style Black / 12ft Cable Length Item # 10107926 Store SKU Manufacturer Product # BB642W31 Availability In Stock: Ships next business day
Product Style Black / 6ft Cable Length Item # 10107925 Store SKU Manufacturer Product # BB642W30 Availability In Stock: Ships next business day
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