Fuel gauge wiring question

There's another way to disable the voltage limiter in the fuel gauge without cracking it open.

FABO member @RedFish and his brother devised this method several years ago, and have performed it several times for themselves and others. I learned of it after I posted the RTE method, and Redfish subsequently posted his simpler, easier fix.

This covers the limiter disabling. You can find more here on FABO by searching limiter and disable by Redfish in the search box.
It is not necessary to remove a gauge cover and bend something to isolate that mechanical limiter and substitute a solid state regulator. All that you really need to do is 2 steps... Lift the 3 post gauge and cover a slither of metal on its back side with electric tape to isolate it from chassis ground like any 2 post gauge is isolated from chassis ground.
Since the switched 12 volt wire to the limiter in the fuel gauge serves nothing more in the inst' panel (blue with white tracer), back it out of the round harness and route it to whatever solid state regulator mounted anywhere you want. Route the substitute regulators 5 to 6 volt output to anyone of the traces on circuit board that carries that current and you are done.