Your coach is identical to mine - and therefore, should already be hooked up that way, unless some component has been replaced.
As stated above, there is a RCA cable that goes from your Westinghouse TV (audio out) to the Executive box - audio in.
All I have to do is turn on the surround-sound switch (black switch above Wineguard outlet) and my TV blasts through all 9 speakers!
Lurking - future Super C owner
2015 Landmark Newport
2019 Ford F450 tow vehicle
sold 2008 Berkshire pusher
sold 2010 Mini Cooper Convertible toad
sold 2015 Nissan Frontier toad