2005 Lexus LS 430 Owners Manual - Page 120

GAUGES, METERS AND SERVICE REMINDER INDICATORS D Idling for a long period with the air conditioning on in stop−and−go traffic. D Towing a trailer. TACHOMETER NOTICE D 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. D Do not continue driving with an overheated engine. See "If your vehicle overheats" on page 405. 13L144 The tachometer indicates engine speed in thousands of rpm (revolutions per minute). Use it while driving to prevent engine 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. NOTICE Do not let the indicator needle get into the red zone. This may cause severe engine damage. 81