What is the example of Speedometer?

Speed:
Example sentences:

1. You will get a ticket if you go over the speed limit.
2. My parents bought me a 10 speed bicycle for my birthday.
3. I've never tried speed dating, but my friends say it's fun.
4. My computer is lagging because of the speed of my download.
5. I will bring you up to speed on the research we have done so far.