Gas gauge not working

Dont know if this is the right thread to post this on but i recently had issues with my gas gauge(and temp gauge) so i replaced the voltage limiter in the dash and the gas gauge sprung up a little bit above empty. So I figured I was close to empty, went and filled up my tank and proceeded to look at my gauge and still reads barely above empty. I clip leaded a wire to a ground and the wire sending unit on my tank and it now jumps to about a quarter full. Is that pointing to my sending unit being the problem? Or the gauge it self? Any help is greatly appreciated