Originally Posted by 1967brutus

I don't think you can "sync" the solenoid with the regulator movement, because when the solenoid is closed, the regulator won't move.

But it MIGHT be usable (provided accuracy of the hall sensor allows it) to derive some sort of flow measurement out of that signal which either could be used for R&D, or possibly as a cascade control for fuel feed. I'd have to think about that.
But as it is, I'd say that cascade control simply is way too complicated.for our purpose.