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

Apple recently revealed a new version of its CarPlay system for vehicles, which include gauges like speedometers. But even Apple, the company that cast aside tradition when it reinvented phones, music ...

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 ...

DETROIT - 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 ...

Auto Meter's 170 series speedometer is available in three mph ranges: 120, 160 and 200 mph. These electric meters feature a built-in calibration screw, permitting easy adjustment of the needle. This ...

If a production car with a Roman Numeral speedometer exits, I don't think I've seen it yet. I have a lot of hazy memories of some really old things from the early 1900s that might have had such a ...