how can i wire three t.v and a tunner to

It's really easy. What is the radio you have in there now? Is it a screen? Power and Ground:      Power can be pulled from a relay from your ACC line. Make sure each one is fused.      Ground to your chassis. Same as an amp, same as the DVD player, same as the stereo you have in there now. Video signal:      Buy a video amplifier (~$20). Power is the same way as above. The video output (yellow) of your DVD player goes into the Video-In RCA. The outputs (up to 4 total on standard models), go to each of the monitors yellow cables. You may need male-to-male adapter plugs. Audio Signals:      Buy an FM Modulator. You can buy one that plugs into your AUX of the stereo, too. Your call. The audio signals (red and white of the DVD player) plug into the inputs of the modulator. Then plug the antenna plug from your car into the modulator, and the output antenna plug from your modulator goes back into the stereo. Anything else? Did I miss something? Fuse ALL power connects, too! Oh, yeah, there is no need to yell! J/K Good Luck! DXAV