Originally Posted by ringlander
Realistically i don't think it would and here is why. That anti slouch feature which keeps the fuel gauge from bouncing all over the place, would affect it. The gauge is a median, an average of the high and low point of fuel in the tank and if they did have something like that it would be baaed on pressure not level . Also if your fuel pump was going bad, it doesn't change the map it blows up your motor. And lastly its called a dummy light for a reason. These are not facts just general knowing how they engineer cars.
Think op means when light is on, which means you can tap that signal and use it to do something regardless of how much gas is left. So in theory yes you could swap maps no problem. all it is, is basic electronics and programming nothing special. That being said its like i said is it worth the work. If op is just trying to do it so he can gain few extra mpg till he gets gas not worth the work. But that's just my opinion, each his own