Measured the amount input, divides by the total storage, and lights up a light for every 10%
Alarm and notification, just switch "steam" icon in the speaker for whatever you want.
When below 50%, turns yellow, when below 20%, red and starts alarm
Completely self-powered (If desired)
Change the constant combinator to have "A" be the number of storages, and "B" be the amount that each storage can hold.
Hook up whatever input you want to one of the electric poles with green wire
Included are blueprints with and without concrete, as well as with and without self-generating power