Here's how car speedometers calculate how fast your vehicle is going. And here's why they may not always be accurate.

In a modern car, your speedometer might look analog, but it is almost certainly digital and driven by the computer that has to monitor all sorts of things anyway. But how did they work before your car ...

The speedometer, whether mechanical or electronic, is basing its calculations of speed on revolutions of your wheels and an assumption that they are the same diameter as those that came with the ...

DETROIT (AP) – The speedometer on the Toyota Yaris says the tiny car can go 140 miles per hour. In reality, the bulbous subcompact’s 106-horsepower engine and automatic transmission can’t push it any ...

Google Maps is adding a live speedometer and speed limit display to its iOS and CarPlay apps. These features allow users to monitor their speed and stay within legal limits while navigating. Android ...

I can't be the only one who's had trouble hooking up a speedometer to a modern transmission—especially when a cable can't be used and an ECU converter or pulse ...