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Start by checking the fuse for the warning lamps and gauges. Does it have power on both sides of the fuse with the ignition on?
Do the other gauges and warning lights in the instrument cluster work?
In the rear floor, above the fuel tank, there is an inspection plate. This enables access to the fuel sender without having to drop the fuel tank. Remove this cover and you will see the wires for the fuel gauge....should be a yellow with a black trace wire and a black wire. Disconnect the plug from the fuel tank and with some wire or paper clip (just don't damage the pins in the plug) join the yellow with a black trace wire and the black wire together. Ignition on the fuel gauge should now read full? if it doesn't try connection the yellow with a black trace wire straight to ground.
If the gauge does read full you will need to remove the fuel sender unit from the tank and make sure the float is still connected and hasn't fallen off. Then perform resistance checks as per attachment.
If the gauge doesn't read full you will need to remove the instrument cluster and check continuity of the yellow with a black trace wire.
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