You are going to have to post a picture of what you got to get feedback. Not sure what a Dash TV is...do you mean a screen in the dashboard? Is TV it's only function? Does it serve as rear view camera monitor too?
also post what RV you have in your signature.
2002 Newmar Mountain Aire Limited 4370 w/ Spartan K2 and Cummins 500hp
ASE Master Certified (a long.....time ago...)