I've got a clarion DB625MP which has 2 sets of pre-outs. If i were to say, hook a LCD display up, would i have to purchase some type of device to allow input into the HU? Would a dvd player act like that? I'm pretty sure pre-outs don't act as inputs. Has anyone else done it where they hook up a separate dvd player in the car?

96 Contour LX ATX Clarion DB625MP 2 "5x7" infinity kappa's in front 2 stockers in back 1 JBL GT 1200D 12' 1 jensen xa2150 pushing the sub *upgrades comin soon