Home Assistant now has native support but the native integration doesn't do tank percentage calculation. Follow this discussion for updates or comments. https://github.com/spbrogan/sensor.mopeka_pro_check/discussions/22
There is a great esphome integration that works well and is easy to use. Please checkout the esphome integration here https://esphome.io/components/sensor/mopeka_pro_check.html?highlight=mopeka
Basic package for using a BLE adapter to passively read BLE GAP advertisements looking for Mopeka Pro Check Sensors and decoding the mfg data.
Fluid depth, sensor battery voltage, and other information is available.
Github Project here: https://github.com/spbrogan/mopeka_pro_check