It’s the latest in instrumentation for the well-appointed shop — an acoustically coupled fast Fourier transform tachometer. Sounds expensive, but it’s really just using a smartphone spectrum analyzer ...

With more and more new-car buyers choosing automatic transmissions over manuals, why do tachometers still have such a large presence on dashboards? The tachometer displays engine speed in revolutions ...

If you’re into anything even vaguely mechanical on the broad hacking spectrum, you’ve come into contact with things that spin. Sometimes, it’s important to know precisely how fast they are spinning!

Whether you're a tinkerer with a custom rig, or you just aren't sure why your computer's fans are running, checking your CPU usage is a pretty common task. Instead of using a boring on-screen activity ...

It’s a good bet most anyone reading this article is quite familiar with the bright yellow 1957 Chevy 2-door coupe that’s known as Project X. This article on how to install an electric tachometer in a ...

For those of us who were young, impressionable hot rodders in the '50s and '60s, there was one piece of equipment that was absolutely mandatory for our cars, a Sun tachometer. It seems as though any ...

These days, a car gaining a fully digital gauge cluster is hardly news, yet it's a little different in the case of the new Porsche Cayenne. The updated version of the SUV, set to debut next month, ...

The circuit shown in the figure is a three-digit tachometer that lets you measure low-frequency events recurring at intervals of 0.235 to 15 seconds--that is, from 4 to 255 rpm. Thus, it's suitable ...

Porsche has always had due reverence for heritage and tradition in its designs. It’s been building the same car for almost 60 years, after all. When it comes to the new Cayenne’s interior though, the ...