KOSO® - Air/Fuel Ratio & RPM Data Logger

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Product Details

Universal Air/Fuel Ratio & RPM Data Logger by KOSO®. The DL-03A is the newest addition into our lineup of multifunction meters which features air fuel ratio reading, RPM and playback ability to optimize your rides performance. The large digits and bright backlight makes it easy to read at anytime. This meter is also easy to operate, compact and lightweight and can be mounted to many applications including snowmobiles, UTV’s and more.


Tachometer - Range: 0 ~ 14,000 RPM; Unit: 1 level = 1,000 RPM
Air/fuel ratio - Range: 9.0 ~ 24.0
Over LEAN setting - Range: LEAN 14.7 ~ 24
Over RICH setting - Range: RICH 9.0 ~ 14.7
Sensor type - Bosch oxygen sensor: LSV 4.9
Compatibility - 2 stroke or 4 stroke engines; ”2 stroke adaptor” BG001855 is optional when used on a 2 stroke application; Requires a DC 12 V battery absolutely(will not function with our AC/DC converter)!
Records: Number of records: 50 sessions
Recording time - Range: 99’59’’99 seconds TR: approx 3.18 Hr
Play mode speed - 1 x play / pause; 3 x play / pause; 1/3 x play / pause; 1 x rewind / pause
Digital volt meter - Range: DC 5 ~ 24 V; Flashing numbers settable range; DC 8V to DC 18V
Heated screen - Optimized visibility under cold weather
Backlight brightness - Range: 3 levels
Indicator lights - 5 red LED warning lights
Effective temperature - Range:14 ~ 140 °F (‑10 ~ 60 °C)
Effective voltage - DC 12 V


  • Expertly crafted from the highest grade materials
  • Precise engineering ensures the latest in quality
  • Rigorous quality control and great functionality

KOSO® is synonym of quality and performance for more than 30 years! Designing and manufacturing high-quality products, KOSO are well-known in the motorcycle, snowmobile, ATV and scooter industries. In fact, its good reputation for reliability and innovation capability made KOSO company a source for many major OEM companies. Whether KOSO manufactures a product under private label, OEM or aftermarket product, the quality always remains a priority. Bringing new technologies and innovative product is also part of KOSO’s philosophy as well as constantly pushing the limit further.

Part Number:

Vehicle Fitment

This part is universal


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KOSO® - Air/Fuel Ratio & RPM Data Logger

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