Ballenger Motorsports AFR500v2 - Air Fuel Ratio Monitor Kit with Bosch LSU 4.9 Sensor Bosch LSU 4.9 wideband oxygen sensor Calibration Quality Wideband Air Fuel Ratio Monitor Kit Includes all hardware for typical installation Durable, proven design which works with Bosch & NTK sensor types Responsive and accurate to within 0.1 AFR