There are two different installation directions with this product.  One for drywall using studs, and one without studs.  I called the manufacturer and inquired about tongue and groove panels - what fasteners would be recommended since I didn't have drywall.  Maybe they didn't know what type of paneling I was talking about, they just kept saying "use the stud method" to install.  Therein lies my problem.  This house was built in the early 1940s, and the interior walls have 24" spaced studs.   I now have two wall bridges that 'shouldn't' be mounted according to the maker...unless I have studs to mount to.