I have the same two wires that are not plugged in. Fuel gauge works fine for both fuel station and generator fuel - however, they are tied into the timer. The timer needs to be on for the fuel gauges to work. Found that out accidentally when the gauges wouldn't work - I messed around and found out I had to turn on the fuel pump timer for them to work.
I turned my timer on and the fuel gauges still don't work so I must have a different problem.