Tank Monitor Idea

We all know that the common tank level indicators are totally unreliable. Some higher end class A's have a way to adjust the tank level readings. See this youtube video for information: Adjust
There are some electronics guru's here that might chime in and give some input as to what components would be needed to build a simple trim panel for our cheap systems. It seems to me that if a small amount of resistance were added to a sensor line, to compensate for the increased conductivity of dirty tank walls, the readings could be corrected.