In order to use a Galil, one must understand how the Galil works. The plugin documentation assumes that the user is familiar with the Galil and we don't try to teach or document Galil aspects that are in the Galil documentation. You can't simply hook up a Galil and run the plugin and it magically work. This is because the Galil has its' own motion planner and can be used as a stand alone motion controller. It is not a "dumb" controller like a parallel port or some other step generator motion device. This makes it more complicated to setup, but the end result is worth it.
The latch inputs are a Galil term. Look at the Galil operator's manual and command reference (AL and RL) and read up on the latch inputs. There is one latch input per Galil axis. You need to wire the probe to all of the latch inputs that from which you wish to get a position. For a 3 axis mill, that would be X, Y, and Z, meaning Galil input 1, 2, and 3. Galil Input 6 is not going to cut it.
Since the probe will be wired to multiple inputs, simply pick one of those inputs and map it to Mach's probe signal. Mach only has one probe signal and it is NOT used to capture the the positions. The Galil does that via AL and RL. However the Mach probe signal is used to prevent a probe move if it thinks the probe is activated. If the probe is not activated and Mach thinks it is, simply check or uncheck the Mach digitize "active low" setting until the signal agrees with the actual state of the probe.
Steve
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ANY of them from the development ftp site are likely to be bleeding edge.