Hi Shawn,
Unfortunately, the Cessna 182RG was made in FS2002 and although it worked in FS9 I can't seem to get it to work in FSX. I've been able to port most of the FS9 aircraft over to FSX, but for some reason this model won't display, plus the gauges used in the panel were made for FS98 so most won't work in FSX. Although you can use the FSX default 172 panel. But without the model not displaying it doesn't make a difference. The 182S from FS9 on the other hand, seems to work just fine, but not the 182RG.
Carenado has an excellant 182RG which was made for FS9, and like most of their other aircraft they have patches to make them work in FSX.
Carenado Cessna 182RG. Of course it will set you back a few bucks.
I have their Cessna 206 and it really works great in FSX.
I don't think the ASHA guys wouldn't mind if you have to use the 182S or the even the default Cessna 172 in FSX for your training flights, since they're all single-engine props.