Are your monitors component or composite. I have tried to do the same thing but the factory dvd is component video, RGB. If your monitors are composite, single yellow rca, then you would need a video transcoder, cheapest i have found is $130 and runs on 115v, to convert the component video to composite video. There is a way to splice into the video out on the dvd player from the 16 pin connector. I have not tested this yet. My concerns is one would need to splice into the video feed going into the monitor and not out of the DVD player. I have disassembled the monitor unit to see if splicing into the wires that go directly into the monitor. I found that the wires are extreamely thin and embedded and a very thin layer of plastic or silicone making it impossible to splice into them. I will be buying the transcoder and splice into the output wires from the dvd to see if that would work, since i already have the headrest monitors sitting at home. Hope that helps.