ok, what i want to do is build a simple adjustable timing camera switcher. i have the factory nav with the pac vci-gm2. it has 2 rca video inputs, video 1 is controlled by 12 volts on the red wire. video 2 is triggered by 12 volts on the blu wire, video 2 has precedence over video 1 even if the red wire is powered. my requirements are, i want to mount the adjustable pot in a blank spot in my 4 pod mount (where the air bag disable is located), i want to be able to switch between normal(nav display), independent(each of the two cameras), and auto( swithing between nav-cam 1-cam-2). i would like to use either fet, or 555 ic chip driving a relay, maybee a 7805 regulator to power 555. if there is a simpler way please chime in. you may think its overkill but this is what i want. i await your input, thanx.