2.0.23 (build 80769, win64)

Greetings

I don't think it is a bug, but just an odd interaction between mods, but I thought to post it here should anyone else have the same issue, and how I solved it.

Background:
I am playing a modded PY game. Added Colour Pipes, Advanced Fluid Handling, and Flow ...

Greetings

I have read the wiki, the other posts and redit but can't find the answer to my question
Question : How do I set up the combinators to tell me that nothing has travel on the belt?
To count the number of items (easy).
Background : I need to to 1 action if I have not produced any item ...