fuse/short

My fuel gauge bounces around when i turn a corner or hit the gas. I mean like a quarter tank then goes back to normal. Only when completely full it has the right reading. Anything below that it bounces around but goes to norm reading

I saw my temp gauge out of the blue, go all the way up to the 260 mark while driving the car for two min after it sat overnight. I pulled the car over, shut it down for a few and started it back up. It went back to normal. Ever since the gauge reads 205(norm 210) or above 210,never steady on 210. I think if this is a short, and gauge goes up its tricking the computer into thinking its overheating. the fan comes on and goes off after temp gets to 210. Before this always at the 210 mark. Never had any problems.

Are these gages related to the same fuse or relay? if so where?
I know there is a possibility for a short, but how could i diagnose a short for these two gauges?
95 GRAND PRIX 3.1 THANKS ALL!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!

i had a very similar experience only in my case it was the tach and speedometer that were malfuntioning. my problem was a ground wasnt grounding. i had to run a new ground to block and it stoped the gauges from messing up. i hope this helps you.

i had a very similar experience only in my case it was the tach and speedometer that were malfuntioning. my problem was a ground wasnt grounding. i had to run a new ground to block and it stoped the gauges from messing up. i hope this helps you.

how and where did you ground them. Did u have to pull the dash out?