FAST engineers have developed a kit that makes it easy for anyone to measure an engines airfuel ratio. This plug and play universal O2 sensor processing kit allows your data acquisition system or dyno software to record and display airfuel ratios. Since it uses fully automatic sensor calibration, theres no need for manual free - air calibration that competitive units require. Additionally, each sensor kit is a standalone unit, so using multiple kits for measuring all your engines cylinders is easy. Compatible with FAST Digital AirFuel Meters.