Cummins Magnetic Pickup with part number 3866887 for K Series engines in general, both marine and land engines.MPU or magnetic pickup is a sensor that functions to measure engine speed, in other words MPU is a speed sensor. This sensor works on the magnetic principle, and is mounted on the engine flywheel.
The way it works is by changing the GAP reading between the MPU with the peaks and valleys of the flywheel to GGL with a magnitude between 1.5 Vac - 30 Vac. The greater the rotation, the higher teh value of the resulting voltage.
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