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5.0L (1979-1995) MustangTechnical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
I would order the plug and play one from IST. It is only $20 more than the adapter requiring soldering, and allows you to return to a regular OBD-I mass air in seconds. Its what I use for running the 90mm LMAF and works great, plus I never like the idea of cutting up my stock harness.