2008 Jeep Wrangler Owner's Manual - Page 210

UNDERSTANDING YOUR INSTRUMENT PANEL 209 15. Tachometer This light indicates the engine speed in revolutions per minute (RPM). CAUTION! Do not operate the engine with the tachometer pointer in the red area. Engine damage will occur. 16. Engine Coolant Temperature Warning Light This light warns of an overheated engine condition. If the engine is critically hot, a warning chime will sound 10 times. After the chime turns off, the engine will still be critically hot until the light goes out. 17. Sentry Key /Security Alarm Indicator Light - If Equipped Refer to "Sentry Key Immobilizer System" or "Vehicle Security Alarm" in Section 2 of this manual. 18. Coolant Temperature Gauge Indicates engine coolant temperature. The red zone to the far right indicates possible overheating. Seek your authorized dealer immediately if the gauge operates in the red zone. On U.S. vehicles, the temperature is indicated in degrees fahrenheit; and on Canadian vehicles in degrees centigrade. 19. Cruise Indicator Light This light shows when the electronic speed control system is turned on. 20. 4WD Indicator Light - If Equipped This light alerts the driver that the vehicle is in the four-wheel drive mode, and the front and rear driveshafts are mechanically locked together forcing the front and rear wheels to rotate at the same speed. 4