Yup, I wondered what happened too. And then upon closer inspection
of the Fuel Gauge itself, low and behold one of the magnet wires
was broke and wrapped around the female screw post (the screw post
on the right as viewed from the back of gas gauge, not top or bottom posts) near the face of meter (the opposite end of where the screw is inserted). At the time of this writing, I am attempting the repair. I'll probably use CA 4000 Heavy (Super Glue Gel type) to anchor the female screw post inside the plastic to keep it from rotating from the applied torque on the screw, and somehow repair the magnet wire to the post on the right.