@Doric
I tried my best a while back to determine the type of screw, and as far as I can tell, it's not a ballscrew.  But that leaves me with either a Leadscrew or ACME, and I can't tell which.  And even worse, ordering a thread gauge would be guess work without knowing the type and the measurement used, I could potentially go through the purchase of quite a few guages before I got the right one.  I wish I could just buy the right guage, that would be ideal.  I'm hoping it's a Lead Screw cause like you said, they're really cheap.  The only thing I managed to work out with any reasonable amount of certainty, is that it's a right-handed thread I need - lol.

Lead screw is not a thread type, it's how it's used.  As in, moving the carriage on a lathe or the saddle on a mill.  What you need to know is the thread form, is it a "V" thread or more like a "U"?  If it's a "U" shape, then it's probably Acme thread, commonly available and not terribly expensive.  The diameter is the measured diameter of the thread, the pitch is the distance, if metric from the edge of one turn to the edge of the next, if imperial measure, the number of threads in one inch.  A thread pitch gage is not a necessity, using a machinists scale or cheap dial or digital caliper will allow measuring the pitch. Pitch gages aren't all that expensive, and Chinese copies are available.  I've had my Starrett pitch gages for years, think one of the less expensive is about $15 - $20.  Kept dry, they last forever.
Google metalworking.net, go to the dropbox.  More information than you really want, but I do remember seeing some fairly comprehensive info on thread forms.  But like any public and open dropbox, there's also a lot of stuff not even of a general interest except the poster.  You might have to go into the retired files, they're at the top of the list, but searching there is going to take a lot of time, there are a lot of files and a lot of them don't say what they are.  Format is either pdf or jpg for the most part.  But without knowing what it's used for, pretty hard to narrow down possibilities.  OR, google groups, rec.crafts.metalworking, probably someone there that has the identical machine to yours.  Be ready for the slamming of any machine not made in the US, shit happens. 

Doric.

The "I" in Doric is Silent.