The only reference I could find was a 2003 996 owner's manual. It said the pressure should be approximately 3.5 bar at 5000 rpm with a fully warmed up engine. It seems like my 2.7 runs at about that level.
For the volt meter the normal range is 12-16 volts. If it is below 12 with the engine running, you should "have the charging system checked at an authorized Porsche dealer."
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2000 Arctic Silver/Black, Hard Top, On Board Computer
PNP Rear Speakers, HAES 6-Channel Amp, Avic Z140BH,
Painted Bumperettes, 2004 (OEM) Top, Homelink integrated in dash with Targa switch, 997 Shifter, Carrera Gauge Cluster with silver gauge faces, heated 997 adaptive sports seats, Litronics, silver console
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