My gas gauge isn’t working right

Well I just bought a 72 Dart Swinger Hemi orange and well the only thing wrong with it is the gas gauge doesn't respond like it should. I pulled out the sending unit and it moves freely and it responds a tad when I start my car but it doesnt move other then that. I was wondering could it be the dash regulator on the back of the dash cause the other gauges work but the lights are a little dim.
Author: admin