What can occur if your tachometer's needle enters the red zone?

Answer;

-Damage may occur if the tachometer's needle enters the red zone

Explanation;

A tachometer is a sensor device used to measure the rotation speed of an object such as the engine shaft in a car, and is usually restricted to mechanical or electrical instruments.

Tachometer, indicates the engine revolutions per minute. Damage may occur if needle enters red zone. The "redline" on a tachometer indicates that engine speeds above that value are likely to cause damage to the engine, especially if operated continuously at that speed for more than a few seconds.