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OK, check the fuse box to see if the fuses that are designated for these instruments are still in working order. if the fuses are ok, remove the instrument cluster from the dash and, check the back side of the cluster board. pull all connecting plugs to check the metal contacts on the cluster board. try to straightenthe plugs and re attached the wiring harness, this should revive the gauges.
if this dose ot produce results, replace th entire cluster.
it shouldnt be a fuse or the entire cluster would be out. there are a bunch of little light bulbs that swrew into the back of the cluster. best way to check is to pull the cluster and switch the bulb from the gas gauge to something else and see if it works. then just get a replacement bulb from a napa or somewhere like that. it should be a very cheap fix.
Since your speedometers work, the problem is in the gearing to the trip and mileage odometers. Simple problem, major pain to fix but, remove instrument cluster - you'll have to remove speedo cable to get it out. Use the old Mark I eyeball to check for broken parts. Might even have to drop steering column - disconnect air bag first!
I would check the ground wires and fuses. There could be a hairline crack which you can only see by a magnify glass. This hairline crack is enough to kill your gauge. Unfortunately you will have to pull the dash out to get to the cluster of gauges