Thanks for the response Galt.
You are correct - went ahead and programmed/tested the relay output settings via the ATS control panel.
Selected the "Load on Utility" Option. Will run a 120vac coil through it.
The only problem is, because the contacts in question are "dry contacts" I will have to safely find a way to feed 120vac from the utility line before the transfer switch utility input. I'm thinking a small fuse assembly should suffice. Something rated in milliamps.
Also will post pics and a detailed set of setup instructions, also including modifying the transfer switch if necessary to implement one's own microswitch provided the ats does not have one.
(I'ts all simple but hopefully It'll help someone trying to achieve the same effect)