A couple weeks ago my oil pressure gauge would go from normal, drop all the way down causing the "Check Gauges" light to pop on, and then return back to normal. Sometimes it'll stay low for a long amount of time, sometimes it dips down and immediately goes back to normal. I just topped my oil off and replaced the oil sensor. Now it's not going up at all. Do I have a bad pump? Maybe a bad filter?

Edit: I have a 2000 Dodge Dakota 4.7L

 

Put a mechanical gauge on it, and see what oil pressure is really doing.