It is an electric gauge but I checked it with a mechanical and also changed the sending unit same pressure. The pan has not been hit but pump could be clogged. I think pan is accesible from under car. Is changing the bearings doable for a rookie. I have done alot of stuff over the years (heads ect.) but have never changed any bearings. I guess I could maybe give it a go, any tips for process and how do I get the right size bearings?