Sensor 2, Extension Harness For Part Number 7766 18 Inch Extension Wiring Harness For Sensor 2 Of The Ntk Wide Band O2 Module Part Number 7766 MSD IgnitionThe MSD Wide Band O2 Sensor module also provides a 0. 5 4. 5 VDC analog output proportional to the AFR. This analog output can be sent to a gauge or a data acquisition system. A dual color LED provides the system status at a glance. To provide accurate backpressure compensated AFR readings on turbocharged applications, the addition of an Exhaust Pressure Module, part number 7767, is required. The MSD Power Grid Dual NTK Wide Band O2 Module is a dual