On the subject of the EPS. The source of those control knobs is Bruno. (Brunosteering.com). Apparently he is the original designer of the EPS systems for GM.
The source of the SACC "kit" is easysteering.com in the UK. It is their "A" kit.
Bruno now has three add on control devices that just plug into the SAturn Vue/Chevy Equinox CM/ECU.
One is the manual version with the potentiometer knob. That is the one supplied in the easysteer "A kit" and the SACC kit. He has also an "automatic" which varies the boost by reading off of the internal torque sensor, without the need for the control knob and a third which actually varies the assist according to the actual vehicle speed as determined by communicating with a GPS satellite, not the internal torque sensor.
The issue with changing the add on control is that the controls are built for certain individual control modules based on the vehicle and model year they are sourced from. At the moment that is primarily for use with the Vue, which actually does add credance to the claim that the Vue CM/ECU works with other motor units depending on the torque sensor used. They do not interchange with other non Vue based CM's because they contain additional internal software added by Bruno for the specific ECU with the software varying from application to application.
Easysteer isn't telling anyone the source of their components and re-labeling them with their own identification. They won't even show you a picture of the kits. I doubt that SACC even knows as they are just a customer of Easysteer like everyone else is?
I would surmize that if you want the GPS controller, you will need to wait for Easysteer to offer that as an option?
The first ECU Bruno built the controls for is the Saturn Vue/Equinox. There is some proprietary information unavailable but it is rumored that the ECU box is from the Saturn Vue and will work with certain other Japanese sourced motor assemblies like the Versa, Prius or Yaris, that use the same blue torque sensor but this is not confirmed.
Of note, there are also left hand drive versions with the motor on the right side of the steering wheel and right hand drive versions with the motor on the left hand side.
Bruno is working currently on the add on control models for the Prius that he says won't be available for "some weeks".
He is no longer speaking to me because I bugged him too much on the subject but I mention all of this here simply that if you are considering an EPS unit from anyone, you MAY want to inquire about the options available for the add on control devices.
Stay away from Bruno for awhile on this please? He will just chew me out as orchestrating a rush on him unnecessarily. 
I can be a real PITA sometimes and like Orsen Wells once said, "I will make no wine...until it is time!" 
(maybe in my case that should be "whine"?)
He is very friendly and generally answers questions but "even a puppy has teeth and will attempt to defend itself eventually against aggressors".
SAAC has done a nice job in re-engineering the "A" kit for the Pantera into a relatively easy bolt in. Unless you want to screw around with all of this re-engineering on your own, you would be advised to deal with SACC for the easiest install system? Their application is a sound one.