As far as I'm aware you cant do what you want to do, you need a sender from the tank, and then you need to fill the tank to set levels to calibrate the guages, all a bit of a faff tbh. Phil M is right, you need the GPS connected so it can judge range, without that or knowing how much fuel there is, there is nothing to compare or relate to so you have the information you want.
So all you can have, as Phil says is fuel burned which will be reasonably accurate
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I was born not knowing and have had only a little time to change that here and there.
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