One of the new features in the upcoming version of TouchDRO app is tachometer readout. The beta version of the application had full tachometer support for some time now. Over the last few weeks I added directional tachometer support to all four controllers. In this post I will try to give you some ideas on how to build a tachometer for your mill or lathe using commonly available parts. Your setup will vary, of course, but the main principle will be the same, so you shouldn't have too much trouble to adapt these designs to your particular needs.