2001 Cadillac DeVille Owner's Manual - Page 151

Vehicle Speed Limiter This feature prevents your vehicle from exceeding speeds that the tires are not rated for. When this happens, the engine's fuel supply is shut off. When the vehicle speed slows, the fuel supply will come on again. NOTICE: Do not operate the engine with the tachometer in the red area or engine damage may occur. 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 is shut off. When the engine speed slows, the fuel supply will come on again. This helps prevent damage to the engine. Tachometer (Analog Cluster Only) This gage indicates the engine speed in revolutions per minute (rpm). 2-81