Lexus 2008 IS250 Owner's Manual page 135

NOTICE
To prevent damage to the engine and its components
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Do not let the indicator needle of the tachometer enter the red zone, which indi-
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cates the maximum engine speed.
The engine may be overheating if the temperature gauge is in the red zone (H). In
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this case, immediately stop the vehicle in a safe place, and check the engine after
it has cooled completely. ( P. 400)
2-2. Instrument cluster
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