Read our Tech Article on the use of a Air/Fuel Gauge for tuning a carburetor before purchasing.

The 02 sensor is included.

Accurate Information
The Air Fuel Ratio Monitor is the most affordable "true" wideband technology to date. Many low-cost air-fuel ratio monitors do not use wideband sensors; they simply manipulate a standard narrow-band oxygen sensor signal with rough inaccurate data resulting in only marginal success.

True Wideband Technology
The HW air/fuel monitor that senses exhaust oxygen, carbon monoxide, hydrogen, and hydrocarbons in the exhaust and calculates real time air fuel ratio (AFR). Air Fuel Ratio is a crucial parameter that dictates horsepower and engine performance. Performance enthusiasts and tuners can use Air Fuel Ratio information to make adjustments to the fuel delivery system (carburetor, fuel injection) to help achieve the maximum horsepower available from their engine.

Cost Effective
Traditionally these types of tools commanded price tags in the thousands of dollars putting them out of reach for most enthusiasts and amateur/grassroots racers.