2005 Cadillac DeVille Owner's Manual - Page 160

English/Metric Button By pressing this button located to the left of the steering wheel on the instrument panel, you can go back and forth from English (miles) to metric (kilometers). Tachometer (Analog Cluster Only) This gage indicates the engine speed in revolutions per minute (rpm). Other readings such as temperature, fuel and trip odometer also go back and forth between English and metric. Engine Speed Limiter This feature prevents the engine from operating at too many revolutions per minute (rpm). When the engine's rpm are critically high, the fuel supply to the engine will shut off. When the engine speed slows, the fuel supply will come on again. This helps prevent damage to the engine. 3-44