You shouldn't have to drop the engine. Just have to remove a few parts to gain access to the oil pressure switch. Keep us updated and let us know if this fixes the problem or not.

 

There is a write-up on Renntech at the link below if you have access. I plan to expand on that once I get going.

http://www.renntech.org/forums/tutor...-dirty-method/

 

One way to have it fixed - It did fix mine

last week while driving the 997 s 2005 I realised a warning ( oil temp. indicator faulty ) on the Dashboard screen. I first though it might be a fuse issue. However I did a research and found out that its a much simpler fix. Electric conflict caused the dash to remember and save the warning. That's it, It was NOT a sensor 300-600$ issue . The oil temp. gauge went unresponsive and Oil level indicator was also faulty. However I removed the - wire attached to the battery only for about 30 seconds and replaced it back. All was gone and I was back with the gauges working as new. I am glad it was only an electronic conflict and nothing more. One more thing , once the battery is connected you will have a PSM warning. Dont worry it will go off shortly after you drive it. note: its a manual trans 997 S. Hope it works for you*