Aftermarket fuel gauge
I installed aftermarket gauges in my duster a few years back.
I'm using NVU gauges, they have programmable units utilizing dip-switches. (The fuel gauge is set for 1965-86 Ford/AMC/Chrysler. 73-10)
The TSM I read stated that it was 73 ohms for Empty-STOP and roughly 9.6 ohms for Full-STOP.
80-10 COULD technically work I guess... You'll just have to gas up before it points directly to "E = Everything is okay".