are you talking about the ecu? or an engine? what are you asking? obd1 is much easier to tune, which is the most important thing you can do to a turbo anything
??? Do you mean a ob1 engine into a ob2 car and ob1 ecu? I'm I correct? If you're talkin about obd1 ecu --obd2 car then you'll need a conversion harness or you could wire it in yourself.