Water tank level sender unit make and model for Bavaria 37 sailboat

[Roissy]

Hi guys

Shot in the dark here but fitting a second water tank forward and need to know the tank level sender unit make and model number, apparently there are 3 sorts. The wiring is already in the loom under the forward berth and there are no identifying marks on the unit on the aft tank.

Any ideas ??

Many thanks

David