CONTROL CONSOLE DESCRIPTIONS 16 RT115 Tier 2 - CONTROLS This gauge displays engine rpm and records engine operating time. Use to schedule tractor service. Coolant temperature indicator will light and alarm will sound if coolant temperature is high. Turn off engine and let cool. Check cooling system for low fluid level, seal damage, or leaks. Coolant Temperature Gauge This gauge displays cooling system coolant temperature. Normal coolant temperature is 180°-220° F (82°-104° C). p Tachometer/Hourmeter If temperature is high: