Thanks for replying!
The dials are pretty easy to turn. I was into rc planes and helis back in the day, and I'd say a standard servo would work fine on the dials. One of the dials (driver's side temp dial) does not turn 360 degrees, so some kind of code will have to be written for +/- limits, but the other dial (passenger side temp) can be turned inifinitely either way. It may not hurt to buy a couple of higher torque servos for the dials just to be safe.
I was browsing around today and found an app for the Ipad called "Ardumote HD"... I'm reading about it right now, but I'm just trying to find a way to communicate with the Arduino solely with the Ipad. I mean if initial programming with a pc is required, then no worries, but I want to be able to cut the cords and pull the vette out of the garage with full control of the hvac.
I'm also sketching up some kind of "box" to mount the hvac control and servos with some push-rods to interact. The dial servos may need some type of gear set up.
I think it would be kind of neat to design an interface on the Ipad that looks like the factory controls, but that can come later.
Is there a way to add the extra needed power for 7 servos via dc?