I wanted to check my heating oil tank from anywhere and anytime and not worry about running to the basement to check oil level. I also wanted to prevent middle-of-the-night run-outs, especially during cold weather. This enables me to track heating oil usage by the hour, quarter hour, whatever data capture frequency I wish. I can now know how much oil burned exactly throughout the day, and adjust the thermostat to conserve fuel. Detailed write up is on Github
https://github.com/pettycashstash/oiltankmonitor/wiki