I'm having the fuel sensor issue now too. The Techron fix is garbage. The problem actually started AFTER a tank with Techron.
Looking at the sensors in the service manual, they are simple float sensors. With the last dot not lighting up, it seems the passenger side sensor is the issue (this float reads the upper level of the tank). I may try pulling out the fuel pump and sensor just to have a look. Maybe just bending the float arm a touch will fix the issue. Hell, my gauge worked fine for 9k miles and only now it's F'd up.
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2013 Cadillac V-Wagon, RIP Z
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