I understand this, but the OP is wanting to use a low oil sensor as a defense. It's not a solution to taking a rock, but it's a diagnosis and monitoring tool. Low oil pressure can tell you a lot of things. Combined with a skid would be the best solution. Skid will protect, but it won't tell you anything of what's going on with the vehicle.
I don't run a skid plate. I run a hybrid pan, but I don't subject the car to harsh driving environments other than the poorly taken care of freeways and roads around here.
What "defense?" If you blow out an oil pan or a turbo oil feed line you're likely going to drop oil pressure so quickly that it'll be a toss-up as to which would alert you more quickly, the oil light or the needle on the oil pressure gauge (another thing one has to monitor- how often are you going to be looking at it?). And at that point you're likely going to be toast. If one's engine is going through oil in a more gradual manner then simply monitoring oil levels should be sufficient to ward off any oil light or needle drop. If your engine has oil pressure issues due to mechanical issues (pump, bearings etc.) then one should really look to rebuild/fix (rather than driving and watching for some critical level to occur, which will happen, eventually given enough miles- I have not heard of this really being any concern with [these] engines under 300k miles or so).
My driving is all nice highway roads (I'd put them up against anyone else's as to condition). However, it's not the ROADS that are the concern, it's debris. Crap flies off/out of other vehicles, and out in the country there's some interesting stuff that manages to escape. Oh, look! A chunk of firewood in the middle of the road! Swerve? Into the opposing lane with on-coming traffic (a logging truck)? Nope. Off to the right, into a ditch? Not smart either. Hit it head-on, That's the option.
120+ thousand miles and I have yet to have any oil pressure issues. Meanwhile I've hit plenty of crap on the roads.
Just about anything is possible. I operate based on probabilities. If one has plenty of money (and time) to spend to cover more possibilities then good for them.
I'll leave readers with this, from
MyTurboDiesel.com:
The aluminum oil pan is easily cracked if car bottoms out in a pothole, is hit by a rock, you run over a road alligator (shredded and blown out truck tires), or hits other road hazards. This article shows installation of a hybrid steel bottomed/aluminum oil pan that is more durable.
However, any good hit will crack the aluminum sides of the oil pan vs. a metal skidplate which transfers the impact to the body through the supports. To decrease the likelihood of cracking the oil pan, refresh the suspension if it's worn out (many years of weight sitting on the springs causes them to sag and the bushings to compress) and get a metal skidplate to replace the plastic water shield.