I would go for a float type sensor but aim to keep the pot dry. Either encapsulate and seal it really well, or put the electrical part outside the tank and use a pushrod/lever to operate it remotely from the float.
I would go for a float type sensor but aim to keep the pot dry. Either encapsulate and seal it really well, or put the electrical part outside the tank and use a pushrod/lever to operate it remotely from the float.