Speedometer: Digital or analogue indicator placed on the dashboard that shows the speed of the car.
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An iron cable or an electrical sensor monitors the rotation speed of one of the wheels (usually the front one) and, through a mechanism or certain mathematical calculations that take place in the ECU, the moving speed of the car is shown in the speedometer, which may be analogue or digital.
Recently I changed the white LED light to normal yellow lamp , on that , In speedometer show as check headlight low and high, but I have the headlight lamp dim and high.
Pls refer below image.