Used you will have to find a retrofit for a compressor fridge. They all have tank monitoring. If you want the upgraded monitoring, once again that would be a retrofit and require cutting out some foam. They haven’t built a 19 with the compressor fridge and capacitive tank monitors yet. That’s a 2021 future build for someone.
There are compressor fridges you could retrofit depending on the model / size. Cutting the foam is not difficult, but time consuming and respraying is messy. It is doable depending on your skills and willingness.