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Both old and new gas gauges rely on the fuel tank level sensor, which consists of an angle sensor and a float. You can read voltages directly from it, and come up with a pretty good guess as to how much gas is in the tank. It will vary when the gas sloshes around, or if you're cornering, or on anything but perfectly level ground.
Obviously, gas tank geometry is different for different cars. If you really want to calibrate your level sensor voltage vs. volume of fuel in the tank, I don't see any option other than draining the tank, then adding carefully measured amounts of fuel while recording voltage. That's a lot of work, and you might be unimpressed with the accuracy anyway.
P.S. you should create a Garage entry for your car so we can see what you're driving.
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