MAF Conversion

This is what you need,along with a Mass Air meter and a computer.This is what I used,and the wiring took about 45 minutes (taking my time).Great kit,and cheaper than a new harness.The repinning is super simple....move two wires,add two wires,splice two wires.Done.The kit has great instructions.I'm using an A9L computer and a Mass Air meter (73mm) and sensor from a '90 V-8 T-bird.Again,super easy,and the total supplies are as follows....

-Mass Air wiring kit
-computer
-mass air meter/sensor,
-air intake tubes.

This has it covered. Mustang Mass Air Conversion | StangNet

As Vinnie said, just convert the original 86 harness over by adding in the 4 MAF wires. Do it correctly, and add the FPM and VSS wires also.