2007 Toyota 4Runner Owners Manual - Page 161

06 06.07 Tachometer D Idling for a long period with the air conditioning on in stop−and−go traffic. NOTICE Do not let the indicator needle get into the red zone. This may cause severe engine damage. D Towing a trailer. 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" on page 378 in Section 4. CY15003 The tachometer indicates engine speed in thousands of rpm (revolutions per minute). Use it while driving to select correct shift points and to prevent engine lugging and over−revving. Driving with the engine running too fast causes excessive engine wear and poor fuel economy. Remember, in most cases the slower the engine speed, the greater the fuel economy. 2007 4Runner from Aug. '06 Prod. (OM35866U) 145