In the late 70th, early 80th, when I was a kid, the hot shit on everyone’s bike around the block was a speedometer. At that time, the parts were indeed constructed purely analog. A shaft caused by a driver at the wheel made the speed indicator go around. We felt like driving daddy’s car.
Nowadays everything tends to optimize the good old mechanics away. Even the largest bastion of analog valves, the automotive industry, is increasingly on current digital display technology. But now the Omata One cycling computer try’s to bring the classic analog speedometer back on the wheel.