Which One is the Tachometer and Speedometer on the Car?

[GemmaLee]

The one with the unit r/min is the tachometer, and the one with the unit km/h is the speedometer. Here are the details about the tachometer and speedometer: 1. Tachometer: The car's RPM in the tachometer refers to the engine speed, which is the number of revolutions per minute of the engine crankshaft, reflecting the engine's working condition. When observing the tachometer, you can see that it displays the idle speed, and the red line indicates the engine's maximum RPM. The higher the RPM, the faster the piston moves, and the higher the demands on the engine. Therefore, by looking at the maximum RPM on the gauge, you can also assess the performance of the engine. 2. Speedometer: The speedometer shows the car's driving speed. A higher speed means the engine RPM is definitely higher, but a higher engine RPM does not necessarily mean the car is moving faster.