2008 Toyota Tundra Owners Manual - Page 213

07 11.20 Oil pressure gauge The gauge indicates the engine coolant temperature when the engine switch is on. The engine operating temperature will vary with changes in weather and engine load. If the needle moves into the red zone, your engine is too hot. If your vehicle overheats, stop your vehicle and allow the engine to cool. Your vehicle may overheat during severe operating conditions, such as: NOTICE z Do not remove the thermostat in the engine cooling system as this may cause the engine to overheat. The thermostat is designed to control the flow of coolant to keep the temperature of the engine within the specified operating range. z Do not continue driving with an overheated engine. See "If your vehicle overheats" in Section 4. Type A Normal driving Idling XS16005 D Driving up a long hill on a hot day. D Reducing speed or stopping after high speed driving. D Idling for a long period with the air conditioning on in stop−and−go traffic. D Towing a trailer. Idling Normal driving XS16006 Type B 183 2008 TUNDRA from Apr. '08 Prod. (OM34477U)