What Causes the Engine Tachometer to Stop Moving?

[VanGemma]

Reasons why the engine tachometer stops moving: 1. The speedometer in the vehicle's instrument cluster may be malfunctioning; 2. The vehicle's wheel speed sensor may be faulty; 3. The vehicle's mileage sensor may be defective; 4. There may be foreign objects stuck inside the gauge. The engine speed directly affects the number of work cycles per unit time or the effective power output of the engine, meaning the engine's effective power varies with different speeds. The effective power specified on the engine's nameplate and its corresponding speed are referred to as the rated power and rated speed, respectively. The operating condition of the engine at the rated power and rated speed is called the rated condition. The rated power is not the maximum power the engine can produce but the maximum usable limit of effective power determined based on the engine's intended use. For the same engine model, the rated power value may differ depending on its application.