I had the Livorsi gauge checked and it is find. So I assume the sender or float is not working properly. When my gauge is on 1/4 of a tank the boat ran out of fuel??? When I fill the tank the gauge only reads about 7/8 ??? Any ideas on how to solve this problem.

There should be 2 small screws on top of the fuel sender. One is to set/adjust the FULL and one is set/adjust the EMPTY readings. It takes some trial and error to get them both set so the gauge reads correctly. There are some instructions on the Livorsi website in the Tech Tool section also. They are more geared toward a new install, but will give you an idea of what to do.