How do I check the pressure of my Bezzera BZ10 espresso machine?

The Bezzera BZ10 has been fitted with a double scale pressure gauge, or manometer. So you will see 2 needles, one is for the pump pressure and the other is for the boiler pressure. The boiler pressure goes from 0 up to 3 bar and the pump pressure goes from 0 up to 16 bar.