Are they each assigned a purpose, to tell something is on, or in position, or at fault?
If so each light will have a separate ground that is activated by whatever function the light indicates. Chances are not all the grounds failed at once. If you check at each lamp, and have voltage on both sides of the lamp, then for whatever reason that lamp is not receiving it's ground signal. If both sides of the lamp are dead, the circuit (probably a common circuit that feeds the 5 lamps and the fuel gauge) is dead, probably a broken solder connection, bad connection, fuse.
If they are instrument illumination lamps, they should have power to one side any time the ignition (or possible the lights) is on, ground to the other side at al times.
Again, these are just typical instrument wiring examples, go by the diagram, not my ramblings!
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