Yes. Replaced one that failed. Does that count?
Read-out was mounted at the headboard of the bed. Sender was pretty much centered in the top of the tank under the master bed.
I did a clear vinyl sight glass on the starboard aft bulkhead next to the bed. This was on a 1987 that had one horizontal tank and one vertical tank, I keep the tanks suction valves open.
Just saying, we do not have a level gauge. with 220 gallons capacity its not been a problem. from experience water volume lasts us 2 weeks with normal use, fuel tank lasts forever, blackwater tank pump out once a week. hope this helps.