I took the Wasp out yesterday ( thought I might pick the young bloke up from school--didn't he love that ) to give it a run and see if the new sender had made any difference. It does seem to bounce up to a reading every so often, but doesn't hold any position for too long. So it is trying to work. Maybe Farmer is onto something.
I also found out that Wasp's don't like rain. As I picked him up from school, the heavens opened up, which isn't good when the wipers fall off the spindle !!
Light weight alloy trays aren't very good for rear traction on utes either.