Parts for Caterpillar 3408C - Sensor & Switch Section Loading... 1 Speed Sensor for Caterpillar 3406, 3408 and 3412 engines 3181181 Magnetic Pick up, 3-pin Connector type. Price: $ 137.07 Qty: ^ Details In Stock Add to Cart 2 Speed Sensor for Caterpillar 3408 engines 3E7886 Magnetic Pick up Price: $ 159.46 Qty: ^ Details In Stock Add to Cart