Excavator Engine ECM Computer Board Engine control module for CAT C7 / C9 / C9.3B excavator decks - supplied against 478-7932, 478-7933, 262-2879 and the C9.3B 521-0791 reference. New board, anti-static packed, application verified from the ECM label and machine serial before shipment. Key Features Engine ECM / computer board for CAT C7, C9 and C9.3B excavator engine decks Covered numbers: 478-7932, 478-7933, 262-2879, with 521-0791 on the C9.3B reference line Replaces the