Gobbleoff is correct. Assuming you have the TV option you just need the correct 1/8" connector with 3 pins? I believe the A/V IN takes composite video and mono audio, while sharing a single ground or shield.

As for TV in motion. You can get cables off the internet that patch between the TV Tuner and existing wire harness, which will allow you to drive over 3 MPH with "AV" selected. Or you can buy an I-Bus interface and use NavCoder with your computer to recode your TV Tuner to allow TV in motion. Recoding the TV Tuner is certainly the cleaner option, but takes more work.