1) Dashboard dial 2) Measuring instrument 3) Meter 4) Place for a needle 5) Sonata instrument 6) Speed indicator 7) Vehicle part 1) Gauge 2) Machmeter 
A speedometer or a speed meter is a gauge that measures and displays the instantaneous speed of a vehicle. Now universally fitted to motor vehicles, they started to be available as options in the 1900s, and as standard equipment from about 1910 onwards. Speedometers for other vehicles have specific names and use other means of sensing speed. For a...
instrument that indicates the speed of a vehicle, usually combined with a device known as an odometer that records the distance traveled.[2 related articles]
an instrument indicating the linear speed of a vehicle
[n] - a meter fixed to a vehicle that measures and displays its speed
speed indicator noun a meter fixed to a vehicle that measures and displays its speed
A device normally found on the dashboard that shows the driver at what speed they are traveling at.