What is the Difference Between Speedometer and Tachometer?

In general the speedometer and tachometer are used to measure and display speed but to be specific they differ in what they represent ie Speedometer displays the speed of the vehicle whereas tachometer displays the speed of the engine.

85mm speedometer
https://www.rico-instrument.com/85mm-gauges.htm

85mm tachometer 

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60mm speedometer
https://www.rico-instrument.com/motorcycle-speedometer.htm

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60mm tachometer
https://www.rico-instrument.com/motorcycle-tachometer.htm

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