Does anyone know how to fix this?

I have a 1996 Lumina and when I accelerate the gas gage moves, the turn signs and hazzards don't work.

I got this car about 6 months ago but, I haven't been able to drive it becuase my dad has tried everything he can think of. He changed the switch and checked all the fuses. He is also having a hard time finding the ground wires. Does anyone know how to fix the problem? HELP!!!