I am planning on attaching it to my SB 11" but it could just as easily work on a mill or drill press. I bought the complete kit for the half-size unit.
Here are the pics from the MachTach http://www.machtach.com/ web site:
The kit is fairly well made and the components are good. It took a couple of weeks to get the kit after payment, and a follow-up e-mail but the owner of MachTach isn't trying to run it as a business, it's more of a hobby for him. Really not too bad considering what it takes to get quality circuit boards made and source the components. The build instructions for the kit are downloadable off of the MachTach yahoo group http://groups.yahoo.com/group/MachTach/ if you are interested in what goes into the kit.
If you are handy with a soldering iron it shouldn't take more than a few hours to put one together.
I'll post some further pics and a mini-review once I get a chance to put it together (a little pressed for time at the moment as the wife just informed me that we are leaving on vacation in a couple of days - don't know how I lose track of that stuff).
-Ron