I have controller ("X") and Antenna II ("X"); this is my "output" set. Controller X has loose storage connected to STOCK module. Stock quantity is wired to A>B comparator input as A, with B value hard-coded at 400. C output is wired to AM-B input (and F-B display, which shows expected green/HI signal).

I have controller ("Y") and Antenna II ("Y"); this is my "input" set. Controller Y has A…