[WFBowen]

Enrique:
I may be misunderstanding the situation, but here's my take: The 911 (as I recall - it's been a while) has three senders; Oil Pressure; Oil Temperature and Oil Level. The oil level sender takes its reading from the resovoir (oil tank) since its a dry-sump system. The sender for the oil pressure on the 912 is basically an on-off arrangement which kills the green light at about 5-7 psi or so. To get the incremental gauge to work, you'll need a different sender. If possible, check to see if the 911 sender has the same thread size or can be mounted with an adapter. Also, VDO makes these for their aftermarket conversion gauges and they fit the 912, however I think they come in two flavors - 0-80lbs & 0-100 +/-, so accurate calibration becomes a problem, but with oil pressure its usually a case of having it or having none, so dead-on gauge readings are not as critical as the fact that the gauge is indicating good pressure or not - make sense? Also, if you're missing the oil level function on the 912, it was always a so-so thing (years ago I had a Jag XK120 with oil level reading and it was really a crowd pleaser to push the button and read my oil level. In reality, it had nothing to do with how much oil was actually in the sump.) Best gauge is still a couple of dirty hands on a clean dipstick!
Good luck.
Bill.