QUOTE(Justinp71 @ Feb 8 2007, 10:45 PM)
Does that oil pressure switch which next to the engine code run the factory "Druck pressure" gauge, I tried to hook it up my the gauge defaulted to max press.
yes, that's the pressure sensor for the gauge.
we need to know more about what you mean by "the" factory gauge, tho, since 914.6 didn't have one, and 911's had at least two kinds. early cars get a 10 Bar gauge, later cars get a 5 Bar gauge, and the senders are different and don't play together.
But as Slits has pointed out, fullscale typically means the gauge is not wired properly (they need +12V, good ground, and the gauge signal, all on the correct terminals) or that something is not connected correctly - fullscale is where Bosch/VDO gauges go when the G(uage) line is open.
it's also what I'd expect if the gauge is actually connected to the pressure switch for the oil pressure light...
Since 914's (4 or 6) had no gauge originally, if your car has one, someone has been creative with the wiring, so that's the first thing to check. You also need to research to make sure you have the right sender to go with the right gauge.