Kelvin-
We have had three sending units installed on our TT before things settled down. The dealer just kept replacing them and telling us the sending unit was bad. The fourth one was the charm.
Unlike your description, ours showed wild swings in fuel on board. One minute it showed full, the next minute it was empty. This happened with all sending units until the fourth and "good" one was installed.
Sorry I couldn't give you more help but that's our tale. God luck!
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