There's another guy on here that goes by "tubularfab". I'm going to box up some old parts and send to him for experimenting to accomplish what you're trying to do. From a processing point of view, it shouldn't be difficult.

Inputs:

Throttle
MAP
RPM
Rack position feedback
VGT feedback (if desired)

Output:

Rack position
VGT position (if desired)

If you want to get fancier, you could add engine temperature to have the ECU limit rack movement until the engine was up to operating temp.

__________________
-Evan


Benz Fleet:
1968 UNIMOG 404.114
1998 E300
2008 E63


Non-Benz Fleet:
1992 Aerostar
1993 MR2
2000 F250