Another fuel gauge issue
This is a nice overview of the issue. My gauge did the same thing a few weeks back. Testing my sending unit's ohm range today.
Also switching from an external pusher pump for my surge tank to an internal in-tank pump, so I have to add the + & - wire "bulkhead" pass-through to the sending unit. I already have the 3/8's" return line silver soldered to it, so space is getting scarce on that small round panel.
Repair Your Fuel Gauge