T25 Autosleeper fresh water tank gauge and probe

[Urge38]

Hi Guys

need a little tec on the Lab-Craft ltd Model No DS 220d, more so, I am looking to know what the meter requires in hOms to read correctly.
My water tank level probe is made up of X6 resisters, all with increasing values (see photo for illustration only) 

I am not sure of the total value or each Indvidual value of each is, as they are very old, and have been submerged in water most off there life, 

I am wishing to get a modern level sensor to match the existing gauge if possible, Or even a diy fix, but I am not too keen of these resisters corroding in the water tank.

see pics 

[Cobra88]

looks like wire on top left should go on bottom left as no circuit on half that loop otherwise
 

[Urge38]

thanks but that's not correct.

I was also asking about a water tank sender question just to keep things on topic 

 

[Cobra88]

ok but can see something was connected to lower left terminal and sorry its not welcome
ill leave you to it