Showing how much is left in a keg

I’ve seen on a couple of other projects the ability to log what has been drunk out of a keg. On the kegbot setup it’s via flowmeters and built on Raspberry Pi. On keg ninja it is tap the screen per drink.

I like the second option as it involves less techy solutions!!! Is there some way of doing that with TapList?

The Plaato scales have been a good solution for me. They work well with sixtels or cornys, but would require some problem solving to adapt to 1/4 or 1/2 barrel kegs.