Adaptronic recommends a fuel pressure sensor for every single ecu installation - this is because fuel pressure is a key aspect in the fuel model and simple nominal fuel pressure will never be as accurate as the actual fuel pressure reading from a sensor.
This sensor can also be used for oil pressure. 1/8 NPT port required( standard on almost all fuel pressure regulators. )
Pin1( VS) is 5V reference
Pin 2 (GND) is sensor ground, NOT engine earth
pin 3 ( V) connects to ecu input( fuel/oil pressure, reference pinout in help section of Adaptronic Eugene software)