Here you can see my system
It uses some Jaxon tricks. He has even models lib, but I'm not so daring.
I put some pictures that can help you to understand. The first one shows my lib folder. The second one is the WW2 folder, with panel and sound libs for WW2 (There's one for WW1 and another similar do Modern planes). The last is the panel.cfg using the Gauges Lib. I was trying for three years with no result.
Cheers
Pepe