I don't know why but I think 6000 kpa is correct (60bar) at idle and increases with engine speed upto around 120bar but I'm not sure if your measuring the lp side as said before.

I doubt you'd have a conventional fuel pressure gauge connected up to schreader type valve fitting measuring hp side.

I always thought you could see a sort of common rail diesel type setup although its a petrol direct injection. Still uses an engine driven high pressure pump (camshaft drive) and a fuel rail with pressure sensor mounted in it and then a pressure control device/fuel pressure regupator.

Not sure what low pressure supply should be but doesn't autodata offer any help.