More accurate gas tank readings

In F/A-18's, and probably most other aircraft, there are several fuel sending probes in each tank. For example, each wing has 3 probes; an inner, middle, and outer. The signals from all three are sent to a Signal Data Computer (or Signal Data Converter, depending on what Lot aircraft) and an average of the 3 is used to determine the fuel load in lbs. There are probes similar to those that are used in racing fuel cells. In a racing fuel cell, they are accurate because the cells are uniform in shape from top to bottom.
I don't really think there is a way to accurately in most gas tanks because they are irregularly shaped, unless there was one probe that read top to middle and another probe to read middle to bottom, each calibrated to read it's own half of the tank, but that's getting way beyond what I could ever figure out how to do.