First off you have a dealer in South Africa? Damn its hard enough to get one close here in the states.
As far as the other info you should be able to get a cable it will just cost a bit more on the shipping and follow the ECMspy software and or manuals which can be downloaded from the top of the page.
I believe the dealer would be adjusting the TPS via their own ECMspy type software. It can be done no problem search the forum a bit and everything will be explained or wait a little longer and someone else with more knowledge on ECMspy will fill you in, I still need to get the cable and software.