I did put the fuel pressure gauge on the input of the WUR - which I assume was the bigger fitting of the two ports.
As mentioned it was reading about 2-3 bar when first starting.
I can easily hook the pressure gauge to the output and check the pressure there as well.
When first putting in the WUR I did look at the screen at the input - looked fine and did spray carb cleaner into the port as well.
Big question still remains the voltage at pins 2 & 3 of the diagnostic plug.
I was told that if it was working it should be around 6-7 V DC.
With a constant 13.8 volts DC on those pins I understand that the Lambda control is in not working properly.
That seems to be the big question - what controls that loop voltage???