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The LCU-One Lambda Controller uses the proven wideband Bosch LSU 4.9 oxygen sensor to measure air-fuel ratios. When connected to your AiM MXL dash or EVO3 / EVO4 data logger via CAN bus, the LCU-One sends Lambda values, air-fuel ratios, and sensor temperature and diagnostics. This version also offers analog connection for simple air-fuel ratio monitoring with your MyChron3 series XG-Log auto dash. Includes sensor.