Adding gas/propane bottle usage to the energy dashboard

Hi There,

I have setup scale on my 45kg gas/propane bottle (88L capacity), which measures the weight and then shows it as a percentage on our dashboard. The price per replacement bottle is a fixed fee of $139.29. So I guess each 1% of the bottle is $1.3929.

How do I go about adding this to my energy dashboard?

I think I need some sort of utility meter helper tracking the usage and a number helper with the price… but I dont quite know how to put to all together.

A few pointers would be helpful. thank you!