D5NN10884A Water Temperature Sending Unit Fits Ford Tractor 2600 3600 4600 5600One New Aftermarket Replacement Water Temperature Sender Switch Fits Ford Fits New Holland Industrial Construction Models: 550 (4 1976 5 1979), 555 (4 1976 5 1979), 555A (4 1976 5 1979), 555B (4 1976 5 1979), 655 (4 1976 5 1979), 655A (4 1976 5 1979) Also Fits Ford Fits New Holland Tractor Models: 2600 (4 1976 5 1979), 3600 (4 1976 5 1979), 4100 (4 1976 5 1979), 4600 (4 1976 5 1979), 5600 (4 1976 5 1979), 6600 (4 1976 5 1979), 7600 (4 1976 5 1979)