The guage on my YJ (90) is bad also. It reads full when I fill it up and 200 miles later reads half a tank when it's empty. After some research and talking to people, I found at that they are notorious for acting up. When I got it, I filled it up, grabbed a 5 gallon fuel can, reset the trip odometer to zero and drove it until it completely ran out of gas. I noted the mileage on my trip odometer and now use that as my gas guage.
I am sure some of the guy here that have been around Jeeps for awhile can tell you more about them.
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