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My oil pressure gage was pegging at 5 all the time, I cleaned both the wire and oil pressure sender terminal. I removed the oil level + Druck Press gage and checked connections... I unplugged the red/blk wires & grn wire on the druck side of the gage-reconnected them. Next, i made sure all the Brown-ground wires were properly seated. My Druck Press is no longer pegged. Haven't had a chance to fully warm up engine, but i'm getting 4 bar/1k rpm on start up. My engine is rebuilt, it has 3,500 miles on it so far. Presumably it was one of the ground wires...
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1988 3.2 Cab
2005 997.1 C2S
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