Ford Replacement Engine Harness

That harness is a direct replacement for a 91-93 mustang, it will not be the same as a 86-88SD harness. The body connectors are different and the pinouts also, because the cpu has to be changed, there are different pins that it tells what to do. Anyways it will work BUT you will have to splice and wire other stuff.

The easiest SD to Mass air is a conversion harness.

MASS air conversion instructions from http://www.stangnet.com/tech/maf/massairconversion.html FREE
A9L (5 Speed) computer from junkyard $100-$150
A9P (Auto or in a pinch, 5 Speed) computer from junkyard $100-$150
70MM MAF from 94-95 Mustang GT - $40-$70
MASS Air wiring harness kit $30-$85

The whole thing is probably less than $300 using junkyard parts.

A9L computers are 5 speed only
A9P computers are automatic, but will work with a 5 speed.

Conversion Harness kits & parts
http://www.mass-air.com/
http://fordfuelinjection.com/index.php?p=54