I think Volvo say that the fuel pressure should be between 4.5-5 MPa (or 4500-5000 KPa or 45-50 Bar) at idle, and also within 10 seconds of cranking if engine is to start.
I've seen my MTPro and Vadis display the correct value in MPa (Mega Pascals) so I think the values you are seeing are being displayed correctly, but that your actual fuel pressure is way to low, well over a factor of 10 too low.