Richard I would really appreciate your help on the gauge flickering issue above. I made a short video just to show how it looks like:
http://youtu.be/lEWS4KTjCog
I also had a strange issue today: each time the system activates and start spraying (I get just "B" appearing or maybe also one bar on the gauge) the "water level" led lights on and then the "w.injection" led lights and the failsafe activates. On no throttle then both lights disappear. If you accelerate lightly (so that the IDC is somewhere around the trigger) you see the "B" led flickering just as normal.
I noted that on the go the problem above occurs but if the car stands still for a while with the engine running it sprays OK for some time, you may get a few bars on the gauge etc. But then after a short run the problem appears once again.
It's -5 in Moscow now and I first thought it could be due to ice particles in the 4mm tube blocking the FAV turbine or something. But I have vodka in the tank, so doubt it could freeze at -5C, anyway it's not an explanation to "water level" led turning on.