I have a minor problem with my gas and temp gauges. My temp gauge works for a bit while driving, but if I do any hard acceleration, it goes crazy bouncing up and down until I let off the gas at which point it falls to the bottom of the dial and sits there until the engine cools. My gas gauge has a similar problem of jiggling back and forth when I have roughly half a tank of gas. It works fine above and below half. Is this something that I can fix myself, and if so, what parts are needed?? The car is a 1987 560SEL.