Faria Water Tank Meter, Chesapeake design

Faria water tank meter.
The scale shows the fresh water level E to F.
Installation diameter 53 mm.
Installation depth 47 mm.
Res. Ohm 1/2 tank: 95
Res. Ohm 1/4 tank: 52.5
Res. Ohm 1/1 tank: 180
Res. Ohm empty tank: 10