Hello, since last year I have been wearing the idea of giving our caravan a tank display for the fresh water tank. I pushed the project before me again and again, until I finally got to realize it. Now an indicator for fresh water and wastewater tank from it The circuit and the sensors are already finished and tested. The control panel is (unfortunately) still in pressure. With some luck I can complete the whole next week. Pictures of it follow. If anyone should be interested in replicating something like this, I would like to include the construction instructions in the file attachment here. This should be done by anyone who can handle a soldering iron. About pictures of your “variants” and/or improvement/additional suggestions … Addendum Since the link with the file attachment no longer works: LINK GreetingNoGolfPS: clearly you could also realize something like this with ICs, MOSFET … But in this simple form it remains also for the interested I think it is a good idea for the Commission to take a decision.