Got the machine up and running to give this a proper test. Appears to work and is within 10% of an analog gauge. I still need to experiment with location to tap into the pressure side. Currently I'm on the far side of the valve block which is super easy, but I expect some pressure drop compared to right off the pump's output port. The MU3 voltage telemetry module only reads to 0.1V which corresponds to 10 PSI. This looks to help smooth the output some.
Uses a step upconverter to boost 3S lipo to a steady 14.0V
All the small pressure sensors are out of stock or made from exotic materials for aerospace applications. Too rich for my blood.