air grabber

i want to fabricate an air grabber for a car but i don't want to do one that you have to flip a switch especially because i suck at electrical work but i want one that goes up whenever i step on the throttle because if you have to flip a switch and keep it up you might as well mold a hood scoop. does anyone know what to use? i heard something about using a vacuum servo and hooking it up to the intake manifold but i need a second opinion because i know the intake manifold carries fuel. i saw a setup on a ram srt-10 that had some stuff hooked up to the radiator and some other stuff i didn't see.

The original ones were set up with a vaccum actuator. If you went to full throttle, the engine manifold vaccum went high enough that it opened the hood. ala 70 RR. You could do the same thing but with a vaccum switch. Have one set up to read engine manifold vaccum and as it hits the full throttle mark, it will hit the switch to lift up the scoop. When you let off, it will go down again.