Spindle orient


Hi there my first post on forum I am working on retrofitting a cincinatti arrow 750 mill with a rotary tool changer there is a 2:1 reduction on belt drive to the spindle there is also a prox sensor to tell controller if the spindle is 180 degrees outdated controller won't now if spindle is on rev 1 or rev 2 is there a input I can connect this switch to I have not found any info in tool changer documentation of masso to include this feature on logic also I don't have a sensor for tool 1 pocket old controller asks for tool pocket number after initial homing and then counts each tool change from there is there any way this could be done or will I need to add another sensor thanks in advance for your help