For your basic stuff, a chip will do. I have tested a few codes for the SPI automatic for FocusSport. I think there are four or five SPI chips available from them.
If you're wanting to get REALLY deep into it, there's a company working on our ECU's @ eectweecer.com I sent them an ECU about 8 months ago. They're working on it, but the adaptability of our ECU's is a problem.
Just wanted to let you know, as it seemed you weren't getting any replies.