Check the multi pin connector to the panel. When I had a similar problem I found the green wire spade connector had broken and was pushed partly out, making an intermittent connection.

Stuart

> On Sep 15, 2017, at 4:33 PM, WILLIAM WITZ <pbwitz@SBCGLOBAL.NET> wrote:
> 
> Hi all  we have an 84 Westy and our water tank readings are all over the map.The readings will float all between red and green when Tank is full.I have replaced the panel with a new Go Westy one and we still have the same problem. I cleaned the posts in the tank and the wires feeding the posts. Still no joy . Anyone have any experience with this issue?  Thanks for your time.
>  Bill Witz 84 Westy Tiico Ol Paint