Big tex screen is ok and in the early days of the Auto tool touch off along with others I helped by working on the metric version and tweaking how it touched off etc but if you want a much better screen based on much more advanced version of the same which is far more refined with some great tools then buy Gerry's 2010 screen set. . . . . It will be the best £10 or so you'll spend.

The CNC Woodworker - Mach3 2010