That is an interesting article, but you quite too soon. The bi-metallic gauges have trimmers to set the E and F points. It takes a few iterations because they effect each other.
But you first need to adjust the float so that it is almost at the bottom when empty. You can also set the float to be almost at the top when full, but that usually requires altering the length of the float rod.
Then remove the gauge but provide a way to keep it electrically connected. The two trimmers on the back side are accessible with a number one Philips. Then swing the float full to empty and back. Move the trimmers a very small amount. After a few swings you will get a feel for how to coordinate the two. If you want to be picky, when you think you are done, install the sender, add some fuel, drain the fuel thru the normal outlet, and adjust the gauge to exactly E.
I sometimes drill holes behind the gauge so as to do the final adjustment with everything in place.