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If all of the other illumination lights work such as the radio, ac, doors, ect.....Then it sounds like you have a loose connection behind the cluster. You will need to remvoe cluster and inspect wiring and connector terminals to make sure they are tight and clean. Let me know if you have questions, thanks.
If they all go dim, this is a common problem with the headlight switch......I'd go ahead and replace it. Let me know if you have questions, thanks.
two things have come up. 1). the fuel gauge either registers empty or full, maybe somewhere in between at times, but it does work correctly and can jump to empty. 2).
the key switch sometimes will not start for several tries.
The fuel guage is either caused by the fuel guage sender in tank or cluster you would need t check resistance and compare resistance when problem is happening if same cluster is abd if different sender is bad.