gas guage problems

I have a 93 wrangler 4.0 - my brother owned it before I did. When he had it, the gas guage never worked. He installed a new sending unit. Now the guage works but it always shows full. WHen it reaches 7/8 of a tank, there is about 2 gallons of gas left. When it reaches 3/4 of a tank, I better get my but to a gas station because I'm on fumes. I am used to this but am wondering if it can be fixed.

I have a 93 wrangler 4.0 - my brother owned it before I did. When he had it, the gas guage never worked. He installed a new sending unit. Now the guage works but it always shows full. WHen it reaches 7/8 of a tank, there is about 2 gallons of gas left. When it reaches 3/4 of a tank, I better get my but to a gas station because I'm on fumes. I am used to this but am wondering if it can be fixed.
You have a float inside of your gas tank that shows how much fuel you have in the tank (on your gas guage). to fix it you need to replace the float which involves dropping the tank and pulling the fuel pump out which is connected to the float. tedious, but not to hard to do