Is anyone running a mechanical oil pressure gauge with a TT "Christmas Tree" setup? Did you just add another T and put it in there? Is there anywhere else to put a true oil pressure sender? (BTW, it's so dumb that Ford uses a oil pressure switch)
Think if I had to use the mechanical I would not use the plastic line they supply, that's for sure. I believe a mechanical gauge is more reliable as well. You could use the ptfe lined braided hose and never have to worry. I'd be more concerned with a leak in the engine compartment then the interior. Don't think the carpet will cause the oil to catch fire but it will make a mess.
Everyone's seen oil in an engine bay go into flames fast. Extra fast while being fueled with outside air while driving.