What car are you going to put this in? I know on the 68-70 B bodies they have their own controller. It looks pretty good, if you're not too hung up on the factory look. If you have heater controls, they have an option for that too. I'd hunt around on their website and call the tech line.
I do have their system in my Charger. It's pretty good at keeping the car cooled off. It's by no means as efficient as the r-12, but it is ok.