For about 2 years now we have been travelling/camping not knowing how much water we still have on board because the sensor has a burnt out part.  If you go here: http://picasaweb.google.ca/ewieber/WestyDomesticWaterTankLevelSensor# you can see the broken part.  What is it and is it easy to find a working replacement.  It shouldn't be hard to solder a new part in.
Another option: Does anyone have a working unit from a parted out Westie?  What would be a reasonable price?  This is from a 1990 Wesfalia camper.  I live on Vancouver Island in British Columbia.
By the way, can someone explain how the unit senses the water level?

Ed Wiebe