I like these valves. It would be really nice if they were also able to read out the fluids in them (probably on the output side, but maybe input could be a configurable choice) to the circuit network, I know I can always use a tank, but these can be dropped easily into an existing pipeline. Even nicer would be if the overflow/underflow levels and enable/disable were controllable via circuit inputs.

Note that the check valves in pyanodons allow readout, so a few of my circuit setups broke when I migrated to this mod in Py...

IMPORTANT: Use with caution. This is not intended to be used by the player, it's there for the valve to work. You can read it without any issues, but if you put any other signals on that wire it might confuse the valve. And there's no guarentee that it won't be changed in the future.

But yes, it's already sort of possible on the green wire. And it only works on the Overflow and Underflow valves. It will read the side that makes sense, like the overflow valve reads the input.

But if you want a reliable way then rather try to find a mod with a 1x1 tank you can use as a sensor.