I know this isn't really an answer to your issue (well, kinda is), but, I don't use the light to tell me where my fuel usage is. I've had a 950 and currently a Liner and neither one really worked.
I use "Trip 1" for my fill-ups, "Trip 2" for my oil changes and I've never run out of gas.
I look at my gauge panel frequently so I know how many miles I have on the current fill-up (have to look there anyway for the light) and when the odometer reads 100+, I start my gas station strategy. I keep my fuel mileage on my smart phone so I know that I'm getting anywhere from 33 mpg to 37 mph on a regular basis and 100 miles gives me a bit of wiggle room.
I've read a few discussions about this over the years and some riders say they light is "dead on" and others have had the same experience as I have.
To me, this is kinda like the self canceling turn signals. Everything is cool when they work, but if they don't, ...
This approach has taken a lot of the stress about running out of gas away from me, and believe me I still have run it down to the 4+ gallon range while riding on the road. This usually only happens when I in a non-familiar area like when touring and not paying attention to it.
There is pretty much nothing anyone could tell me that would make me trust the light.