Easier to get info if you include some details. Like, which control does it have?
I see pics online when I search the model, showing a Centurion 6T, as well as a Centurion 7 control, they are pretty different animals.
Jog handwheel? You mean a Manual Pulse Generator? The lathes I see online have two, one each for the Z and X axis.
I am surprised that Milltronics was not able to help you, I have found them to be pretty forthcoming, when I dealt with them. Maybe they did not understand what you were looking for? Dunno. On the plus side, I have had pretty decent luck with a couple different Partner 4, Cent V controller milling machines, as far as grafting in stuff like a full keyboard and a better, color display, and found that they seem to stick to pretty common standards as far as their hardware goes.
Maybe post some pictures of your lathe and explain better what exactly you are trying to do.