Gas gauge incorrect.

[Footloose301]

Has anyone had repairs done to the mechanism that identifies that amount of fuel in the tank?

Ever since I started doing Autocross I've had issues with this and it's not the normal stuff where people fill up and are missing just 1 dot.

NOPE!

I can fill my tank entirely and it'll show 1/4 tank sometimes, but most times it shows just below 3/4, so I never know how much fuel is in the tank. Last I checked, I can go 300-350 miles on a tank of gas and just recently I topped off the tank and at 220 miles into my trip my gas light came on and said I had 46 miles to go, and then for every mile I drove it took 2 miles off the estimated distance to empty.\

It wouldn't be much of an issue if I didn't have a long trip to NY planned for July. I don't want to take my gas chugging Titan. I'd rather teach the girlfriend how to drive stick and take the Z.

Who has had there's fixed, what was the part called, and how much was it? thanks