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..... with most of the orchard dead I can't see running out of water too soon now.
Oh dear! I must have missed that note if you mentioned it anywhere. Sorry to hear about that. Was it winter kill?
Which are you thinking off? The first one that just shows the level in the cistern? Or the second that controls my transfer pump? IF you are thinking about the transfer pump here's some thoughts..... if the tank was metal and you used the rubber well nuts I think the rubber would insulate the sensor contact screw from the metal. For the pump controller I think that would work. That uses a total of four sensors, two high level and two low level. They are mounted in pairs. IF you are thinking of the first, level only - no pump control, there may be hope too. That uses one contact as a common point, low in the tank. That could likely be just connected to the metal tank itself. Then mount the other three sensor contacts in rubber well nuts. They would just connect through the water same as if the tank was non conductive.I think?