Hello
I attach Post Processors for Mach4-turn ; set for mm and Radius. The "rear" version is designed to works with a rear turret ; in the case of using a rear turret, the tool direction must be set to "secondary"
The CB display (not dependent of front or rear turret)

a front turret with PP Mach4-turn

and the same with a rear turret with PP Mach4-turn-rear

see "Newfangled Lathe Turret Standard.pdf" in the
Docs folder of Mach4 for more infos
++
David