Hello all. I have been looking for a solution to this same "problem" for my folks who are now heated by tanked propane. I'm curious if anyone has made progress in the last 8 months.
My folks have a "Remote Ready" gauge made by Taylor Products. When I was looking for remote monitoring options, I noticed the gauge pictured here is 100% identical and the ad specifies the LevelCon (the product this company sells) fits both Rochester and Taylor gauges.
I did some more Googling and discovered you can buy the Squibb/Taylor sensor for about $80 which is steep, but 30-50% of other monitors - and it gets me closer to having the data in a database/home brew web-UI vs elsewhere/nowhere.
I also found a place south of Seattle, WA that sells the extension cable - maybe they could sell me a sensor, too. I think I need to make some calls on Tuesday.
https://www.northwesttankparts.com/product-p/136105-bq.htm
I am going to do some more research into if the companies will sell me the Hall Effect sensor. If so, then I have to decide how to handle the wiring. The tank is about 20ft from a wall outlet, and a location where I will have another two monitoring devices (outdoor temp and water level). Do I extend and sheath the wires back to the shed, and use a single Arduino for the three tasks? This seems the most straight forward to me.
I will post any updates I have regarding the sensors in the future.
E: Added URL tags, I figured the forum automagically did that. My bad!