Tip for fuel guage problems.
My guage has been doing that "You're on the gas so you have a full tank, oh wait now you're braking so it'* empty" thing for a while. So I was looking into where the sender grounds. G403 and G102. G102 was easy enough as it'* on the lower bolt of the ICM bracket. But cleaning that didn't fix it. After about 10 minutes flipping pages in the FSM I found G403 in the back of the car. If you open the trunk and look in there, Up under that wavy plastic peice on the back of the seat, over on the passenger side, You'll notice G403 as the only wire terminating with the rest of them going through the floor there at P403. I cleaned G403 and my guage is perfect.