According to this website the pressure is o.k.: http://www.bigturbo.co.uk/main4.htm
I find it to be a little bit high, it is definitely NOT too low.
A 2-bar sensor produces about 2.2 Volt at atmospheric pressure
A 2.5-bar sensor gives about 1.8 volt
A 3-bar sensor gives about 1.55 volt.
Also see: https://passionford.com/forum/techni...p-sensors.html
or: http://forzavx.com/gecu/hw/APS02-03_APS05-01.pdf