I work with Omex ECUs every day so that would be the way I'd go. Megasquirt CAN be a very powerful tool, but the technical support for them is very little. They are a DIY project that's only suitable for someone with excellent electronics skills, and the software isn't that good. Omex have people on the end off the phone to help, and Richard (omex boss) has owned an s12 or 2 in his time
