I have the tool Hit Indicator and need to understand how to connect this to Mach3.  I know it's nothing less or more than a micro switch in a controlled height block with a spring loaded indicator pad.  Can this be set up as a Probe in Mach3?  Right now it's wired into my controller on Pin 13 so I think it could work like a limit but not to convenient.  any information would be appreciated.

Yes you will assign it to the Probe input. Do a search for tool height macro or similar as there is loads of info on the macros used.
Hood

thank you........I have since done this search and you are right so many it's hard to sort through.  I am working on it though.