Well, I checked out their programming interface and it's quite simple, if you know C/C++. I know some but have never tried to talk to OutSim through it (only VB6 and Java), so that would be the hard part for me. The jacket already has predefined effects for acceleration, braking and turning. How to translate OutSim to those effects would be another hard part.
On top of knowledge of C/C++ and OutSim, you'll also need their programming files. tngaming.lib and tngaming.h I think, which I did not find on their site.