According to the Santech catalog the control module gets its signal from the pressure transducer, santech part# MT0614

@100psi= 1.50 volts @200psi= 1.80 volts @300psi= 2.85 volts @400psi= 3.50 volts saturation, 4.25 volts@ 464 psi

my quess would be when th... Login to read more.