Hey guys I just picked up an 02 ford explorer v8 last week and I swear on the test drive there was no low oil pressure light but when I went to go start the car the next morning the little gauge was blinking low oil pressure/oil change required. The engine doesn't ping, knock, or make any noises at all. The oil level is completely fine and the engine runs smooth with 78k. I bought an oil pressure sending unit and am going to be installing it today but I am wondering, if for whatever reason the problem doesn't go away with the sending unit, what are my next steps. What is worst case scenario that could be wrong?