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my guess is there is a missing or poor ground in the lighting system, and its trying to pull ground through the fuel gauge, or somewhere along the wiring to the rear the fuel sender wire has rubbed through to a wire to the rear lights-you could start by unplugging the harness to the rear(under the dash) which will also unplug the fuel sender, then jump the sender wire so it is hooked up but not the lights, and turn on the lights and see if the trouble is still there-if its gone, trouble in rear harness-if the troubles still there, disc the front harness to the headlights, see what happens-keep narrowing it down
 
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