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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.
If its a 1990 didnt it come with mass air on it? I am pretty sure speed density was on 1989 but from 90 on it was mass air. If thats what you are meaning by mass meter.