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I too would love an accurate fuel gauge.
At it's simplest, you can simply connect a voltmeter to the factory gauge, X volts means full, Y volts means empty. You could use an Arduino to translate this to actual litres/gallons.
However, as stated already, this would be of limited value as there's still fuel in the tank when the sender reads zero and you can always fill past full.
I've often thought about adding a camera inside the tank for visual confirmation, you could even add a tide stick inside with markings. Only way I can think of to have complete accuracy.
I once nearly ran out of fuel because I put too much faith in my MPGuino, luckily I was at the top of a hill when it began to sputter, and there was a petrol station at the bottom.
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