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Machinery Parts Trading Speed Sensors Replacement suitable for Caterpillar® equipment and many other heavy equipment industries. Accurate speed measurement is required for many engine-driven applications. Our speed sensors provide an accurate and reliable mean of converting rotational speed into a signal that can be measured by electronic control equipment. A speed sensor is an AC generator. It is normally installed into the flywheel housing of an internal combustion engine, to ensure the starter ring gear acts upon it to generate a voltage pulse each time a gear tooth passes the end of the sensor. At Machinery Parts Trading you are guaranteed to get high quality speed sensors at competitive prices with superior quality.