Replacement Water Temperature Gauge will Fits John Deere 3020 4020 4320 AR48640One New Aftermarket Replacement Water Temperature Gauge for John Deere Tractors and Combines This aftermarket replacement water temperature gauge mounts on the instrument panel and allows the operator to monitor engine coolant temperature, providing an early warning if the engine is at risk of overheating. The gauge uses a 26 inch capillary lead with a 5 8 18 UNF end fitting and a 1 2" NPT pipe bushing, and includes a provision for fiber optic