I don't have any specific troubleshooting but start at the battery by cleaning the terminals, associated connectors and grounds to the fuel gauge in case some corrosion has set in somewhere. A failing battery could cause strange electronic issues. Break out the wiring diagram to see the routing.
Let us know what you find so that the rest of us can go straight to the problem when it happens to us ;0
Last edited by TLynn; 09-10-2020 at 07:38 PM.