Why do my oil and battery gauges never move

Thanks a lot. There are no numbers on my charging gauge. Like once my battery went down and I had to jump start it. You would think that it would show charging when I started it, but it didn't. It just popped up to the middle. My oil gauge does the same. When I start it it just pops up to the middle and then never moves. Think I ought to take it to dealership? I'm no mechanic. I used to work on my first car (1939 Ford)but things have changed a bit since then. :)