Originally Posted by Warlock III
A.) The "oil sending unit" and the pump are the same thing.
B.) The oil pressure switch can cause the symptoms you're describing.
I would personally just go ahead and change it and call it preventative maintenance.
It may have been beneficial for me to add that it may just be a geographical terminology issue. I've been a mechanic for over 20 years. However, I may have neglected to take into consideration different regional and/or localization terms that may add to any confusion.
However, to eliminate any linguistic differences it may be necessary to research the specific term under an images search for clarification.
I apologize for any confusion that I may have inadvertently caused.