I have a ZX-75 too on my 19.
Assuming you have a newer model TV with digital tuner, you also need to have the TV learn the channels (AIR, not CATV), you have a setting for that. Hope this helps.
As for audio to the TV, not sure how you mean, the video will show on your TV, but the audio plays through the ZX-75 and its speakers.
Speaking of which, if like in my 19, you may have 1 speaker above the dinette (position A), 1 above the stove (position B) and 2 outside (position C)
Well each position allows for 2 speakers for true stereo, as there is only 1 speakers, you get true mono
. Worse,the wires from the radio are cut at the radio connector, I know 'cause I tried to install a 2nd speaker above the dinette...
Position C, with 2 speakers, is the only position with possible stereo sound.