After some playing around with Excel here is the kind of scaling I've come up with:
The bottom (X-Axis) is the input value in % (so 1-100) the vertical (Y-Axis) is the output value. The diagonal blue line is the linear response (1% in = 1% out) the orange line is scaled based on the shape of the tank.
Since a lot more of the volume of the tank is above the H1 level filling the bottom bit of the tank doesn't increase the % full until that section is full. After that point the % full increases at a greater rate than linear until it catches back up at 100%.
In this instance, since I don't have the tank measurements, I just used some swag values to get the idea of what the math will look like.
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