For what its worth i have found on most high pressure systems petrol or diesel you want to see about 1.2 volts at idle for petrols and cranking/ idling for diesels on the rail pressure sensor.
this indicates the correct pressure, if you don't know what the specs should be.
Message Thread BMW 118i N43B2OUO 2008 - Rough running / cutting out - Fixed # - John Hall February 10, 2016, 9:07 pm
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