Hydros Flow Meters reading 0

[JasonGraham]

I just setup a new collective on a group of tanks - first time using the flow meters and they are all reading 0. I confirmed the flow direction on all the circuits and the flow rates should be more than sufficient (Varios 8 at 100% with flow meter 4 feet away from pump.

I have swapped sense ports multiple times and no change. The flow meters aren't reading anything other than 0.

Next steps / what am I missing?

Thanks,
Andrew