an LCD display panel isn't enough for that? I'm on mains electricity, but off grid for gas and water. If I want to check my water levels I.. tap the water tan

an LCD display panel isn't enough for that? I'm on mains electricity, but off grid for gas and water. If I want to check my water levels I.. tap the water tank. or if I am feeling adventurous I get the ladder out and unscrew the top. If I want to check gas levels, I see if the little mechanical indicator has rotated to the red plastic section yet. I'd hate for any of them to be reliant on some hobby/residential grade IoT set up since they're so simple to check the old fashioned way.