When I got my C3 lathe and X2 mill, I was getting in all sorts of trouble with the leadscrews.....all of them. So I took my dial gauge + magnetic doofa, stuck it appropriately so each slide could be slid. In turn each leadscrew was turned one turn and the amount moved noted. As a result I have the following engraved in my mind.....
C3 Compound 1.0mm pitch
C3 Cross Slide 1.0mm pitch
etc etc
It took about 10 minutes, doesn't require super accurate gear, and its with you for a long time
On my metric C3 with the same dial markings as Gary, there are 40 divisions per turn of the dial, 40 x 0.025mm = 1.0mm
Although I consider myself "bilingual" between metric and imperial, I made the conscious decision to not swap between metric and imperial and to stick to metric. It avoids a whole lot of confusion.
cheers
Bill