this isnt as hard as you think. im not familar with preludes but if you have double din. mount the screen on top cd head unit on bottom. run the audio signal from your dvd player to the auxilary input on you cd-headunit if you dont have one use a fm modulator. next runt he video signal to your screen's video input. power all 3 devices on. press play on dvd open screen set video source to the input number the dvd player is pugged into, next set your head unit to the aux input selector or the fm (if u used fm modulator) then put to the fm station your modulator is set to broadcast over (usually 86-89fm) and you should be good to go.
-krazymatt