Ok heres a simple map test....

pull it from the manifold. Hook up a hand pump to the inlet and pressureize it.
While pressurizing it, make sure the ignition is 'ON' and hook up a Volt meter to the output wire. You should see the V increase and max out at around 4.9v.
If the V gets sporadic, the sensor is prob bad.

Also, do you have the correct 'BAR' rating for the ECU? if the ECU is setup for a 2 bar and you use a 3bar, you'll get issues, but I'm sure you know this already.