How does a RPM gauge work?

An RPM (revolutions per minute) gauge measures the rotational speed of an engine's crankshaft. It typically uses a sensor, such as a Hall effect sensor or a tachometer, to detect the number of rotations over a set period. This data is then converted into an electrical signal, which the gauge interprets and displays as a numeric value or a needle position on a dial. RPM gauges are crucial for monitoring engine performance and ensuring optimal operation within safe limits.