What makes it a bit more challenging at least with online calculators & formulas is the logical assumption you are cutting metric threads with a trapezoidal tool or ACME threads with an ACME tool. They can spit out PD using wires or whatever as long as you stay within the corresponding system. I could be way off base here, but if they are cutting inch pitch with trapezoidal tool to serve N-Am market so the dials correspond to typical 0.100" per rotation, it would be an odd duck, but would work perfectly fine. Seems illogical to do it this way, but so are many similar things on these machines. Anyways, I'm pretty sure I can just lay out the shaft OD & appropriate thread form in CAD, do a path guided cut along a pitch equivalent helix & it will yield a section view I can pick off any dimension to confirm. I can confirm external thread parameters this way.