Hello, my 1996 FZJ80 has a low oil pressure. The gauge will move only a tiny bit when the engine is cold and then it drops to 0. I checked oil pressure with a gauge and it is in fact very low. However the engine works very smoothly and the truck drives like there is no tomorrow. Before I take out the engine to work on the oil pump is there somthing I am missing that I should know. Has anyone encountered a similar problem? Any help is really apreciated. Thank you very much.