The Trusty Speedometer - How Does It Work & How To Maintain It

The Trusty Speedometer - How Does It Work & How To Maintain It | Mint Auto Service

As you cruise down the highway, your eyes inevitably glance at that familiar dial on your dashboard – the speedometer. It's more than just a gauge - a trusted companion, ensuring you navigate the roads at the right pace - but how does it work exactly? 

And because every companion deserves care, we'll also delve into tips on how to maintain this trusty device for a seamless journey.

How the Speedometer Works

The speedometer is a marvel of mechanical ingenuity, relying on the principles of electromagnetism to deliver real-time information about your vehicle's speed. Within its housing, a flexible, magnetized metal cup is connected to the vehicle's transmission. As the vehicle accelerates, the spinning transmission cable turns the magnet, creating a magnetic field.

Adjacent to the rotating cup is a metal disc, also magnetized, but stationary. This stationary magnet reacts to the rotating magnetic field, inducing eddy currents. These currents, in turn, create their own magnetic field, leading to a magnetic interaction that causes the disc to move. The needle connected to the disc follows suit, showcasing your current speed on the speedometer dial.

Maintaining the Precision - Tips for Speedometer Care

While the speedometer is a robust component, a little care goes a long way in ensuring its accuracy and longevity.

  Regular Calibration Checks
Periodically, compare your speedometer readings with a GPS device or a known accurate source. If there's a significant discrepancy, it may be time for calibration.

  Keep the Connection Intact
The cable connecting the transmission to the speedometer is crucial. Ensure it's properly lubricated and free from kinks or damage. A smoothly functioning cable contributes to accurate speed readings.

  Monitor for Vibrations
Excessive vibrations can impact the delicate components of the speedometer. Keep an eye (and ear) out for unusual sounds or movements and address them promptly.

  Protect from Environmental Factors
The speedometer is housed behind your vehicle's dashboard, but environmental factors can still play a role. Keep your dashboard protected from extreme temperatures and direct sunlight to prevent wear.

  Routine Vehicle Maintenance
The overall health of your vehicle contributes to the smooth functioning of the speedometer. Regularly servicing your vehicle, including the transmission system, ensures that all connected components operate optimally.


If your speedometer, whether digital or analog, starts to malfunction, make sure to visit Mint Auto Service! We will take care of it and everything else you are worried about.

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