Yep, I installed one a year or so ago in a Dometic.
The instructions are daunting. I had a Chromebook with me and referred to their website often while doing the install. I did have the refrigerator out because I was doing multiple projects at the same time. With the refrigerator installed it would be a bit difficult removing the shield and installing the sensor on the chimney.
Now I've replaced my trailer and will be installing another one. It will be a Dometic again but I don't plan on pulling the refrigerator.
Since you have a rebuilt unit you might really struggle because you might need to improvise on some things.