My oil pressure gauge is actin a little weird today... Holds about 40lbs at idle, and stays there as i start revving, but when I get to like 1200rpm's it goes down a little under 40. By no means is it in the danger zone, but It never did this before. Then after i get past that tiny little spot that it does it, it comes up to a little over 40 as I keep revving like it should. I just dont understand why it is going down at 1200rpm. Its only in that certain spot in the RPM's. Would it be my oil pressure sender? Where is the sending unit for the oil PSI even located? The oil level is fine. Im not real worried about this, just seems weird to me. Thanks for any help or ideas

Eric