The WEGO III is a complete air-fuel ratio metering system with over two hours of built in data logging for all carbureted and fuel injected engines. It features a waterproof, daylight readable blue LED display for air-fuel ratio and engine rpm, and has a spare 0-5V analog input for sensors such as throttle position or manifold pressure. It is said to be highly accurate with easy, free air calibration to adjust for sensor aging effects. It has a wide voltage range from 11 to 16V with current draw of approximately 1 amp allowing operation from battery or race vehicles without an alternator. The kit includes the WEGOIII unit measuring 4" (11.6 cm) long, 2" (5.1 cm) wide and 1/2" (1.3 cm) high. Unit has a built-in USB interface. Comes with a 48" wiring harness, a Bosch LSU 4.2 oxygen sensor, matching 18 X 1.5mm weld nut and software that runs under Microsoft Windows, XP thru Windows 10.