Review on Oil Fuel Air Water Pressure Transducer Sensor For 1/8"NPT Thread With 1/8"-27 NPT And 30PSI DC 5V Transmitter by Steve Arnold

I ordered this device to monitor output pressure of a pump running between 30 to 50 PSI. That does not matter. I could not get the device to work. It's output voltage is a constant 4.9 when run on a 5.1 supply. This reading holds true even on a bench hooked to a 100psi air compressor. I even tested to see if this was a constant current device and that out put did not change by more than one milliamp across the pressure range.