This kit comes with everything you need to convert your Teminator X (550-937) to a direct plug n play for your fox body.
79-93 Mustang 5.0L MPFI Main Harness
Ford TFI Ignition Adapter
Coolant Temperature Sensor
Manifold Air Temperature Sensor
79-04 Mustang ECU Mounting Bracket
Also comes with Instructions specifically for the fox body.