Dynamic Components Conditional Rotation

I really hoped to have solved this myself… But after 2 full days of attemps I turning to you PRO GUYZZ…!
Attachment more or less speaks for itself. I want B to rotate 90 degrees as soon as A has a ValueZ of zero. I’m sure there is a way… but somehow I don’t seem to find it…

How about you…? Looking forward to your solution(s).
Kind regards,
Rob

Comment edited due to multiple edits above.

I guess I dont have to tell you that it should be HOW instead of WHO… :face_with_peeking_eye: Must be lack of energy that’s left in my fingers… :crazy_face: