Below is a list and ID info for the various connectors attached to the "Electronic Control Assembly" harness...
Connections and modifications required to adapt this stock harness to it's new home are noted below.

AC Clutch Cycling Switch
(2) wires attached
Connector attached directly to the Ford switch, which was located at the top of the suction side of the Ford accumulator.
Ckt883 pink/lt blue
Ckt348 lt green/pink stripe
The Ford switch was closed above 46psi, open below 23psi
These wires can be connected to your origional RX-7 pressure switch if needed.

EEC PowerRelay
(4) terminal connector, (5) wires attached.
Connector attaches directly to the EEC power relay, located just above the ECA's main connector inside the passenger side kick panel.
No modifications required. (wire details shown for referance only)
Ckt16 red/ly green
Ckt60 black/lt green
Ckt38 black/orange
Ckt361 red
Ckt68 orange/black (CKT361 and Ckt68 attached to same terminal)

EGR Vacuum Regulator Solenoid
(2) wires attached.
Connector attaches directly to the EGR vacuum regulator solenoid, located on the top/rear of the passenger side strut tower in the Mustang.
No modifications required. (wire details shown for referance only)
Ckt360 dk green
Ckt361 red
ECA grounds ckt360 to energize solenoid

Manifold Absolute Pressure Sensor - MAP
(3) wires attached.
Connector attaches directly to the MAP sensor, formerly located on the driver's side of the Mustang's upper firewall.
No modifications required. (wire details shown for referance only)
Ckt351 orange/white
Ckt358 lt green/black
Ckt359 black/white

Thermactor Air Bypass Solenoid
(2) wires attached.
Connector attaches directly to the solenoid, formerly located in back of the Mustang's passenger side strut tower.
No modifications required. (wire details shown for referance only)
Ckt100 white/red
Ckt361 red

Thermactor Diverter Solenoid
(2) wires attached.
Connector attaches directly to the solenoid, formerly located in back of the Mustang's passenger side strut tower.
No modifications required. (wire details shown for referance only)
Ckt99 lt green/black
Ckt361 red

TFI Ignition Module
(6) wires attached.
Connector attaches directly to the module, mounted to the side of the Mustang's distributor.
No modifications required. (wire details shown for referance only)
Ckt11 dk green/yellow
Ckt16 red/lt green
Ckt32 red/lt blue
Ckt259 black/orange
Ckt324 yellow/lt green
Ckt349 dk blue

A/C WOT Cutout Relay
(4) wires attached.
Connector attaches directly to the relay, located on the left side of the Mustang engine.
No modifications required. (wire details shown for referance only)
Ckt73 orange/lt blue
Ckt347 black/yellow
Ckt361 red
Ckt883 pink/lt blue

Connector C-135 (black)
(8) terminals.
Located next to the ECA's main connector, in the Mustang's passenger side kick panel area.
Modifications required as noted below...
Ckt97 tan/lt green - connect to "-" side of the fuel pump relay coil.
Ckt359 black/white - connect to neutral safety switch (other side of neutral safety sw connects to connector C-201 Ckt199 ly blue/yellow)
Ckt361 red - connect to inertia switch. connect other side of inertia switch to "+" side of fuel pump relay coil.
Ckt687 grey/yellow - connect to IGN SW. "run".

Connector C-149 (black)
(1) terminal
Located next to the Mustang's battery.
Modifications required as noted below...
Ckt60 black/lt green - connect to chassis ground on fenderwell.

Connector C-166 (black)
(4) terminals
Located at the rear side of the RH valve cover.
Connector plugs directly into the O2 sensor extension harness, so no modifications are required (wiring details shown for referance only)
Ckt60 black/lt green
Ckt90 dk blue/lite green
Ckt94 dk green/pink
Ckt687 grey/yellow

Connector C-190 (black)
(10) terminals
Located at the rear of the engine.
Connector plugs directly into the injector harness, so no modifications are required (wiring details shown for referance only)
Ckt264 white/lt blue
Ckt361 red - injector "+"
Ckt555 tan - Injector #1
Ckt556 tan/white - Injector #2
Ckt557 tan/yellow - Injector #3
Ckt558 tan/black - Injector #4
Ckt559 tan/ly blue - Injector #5
Ckt560 tan/lt green - Injector #6
Ckt561 tan/orange - Injector #7
Ckt562 tan/red - Injector #8

Connector C-191 (black)
(10) terminals
Located at the rear of the engine.
Connector plugs directly into the engine sensor harness, so modifications are not required.
Ckt31 white/red - (connects to oil pressure sender thru sensor harness)
Ckt39 red/white - (connects to coolant temp sender thru sensor harness)
Ckt89 orange
Ckt101 grey/yellow
Ckt351 orange/white
Ckt354 lt green/yellow
Ckt357 lt green/pink
Ckt359 black/white

Connector C-201 (grey)
(8) terminals
Located in back of the Mustang's drivers side strut tower.
Modifications required as noted below...
Ckt11 dk green/yellow - connect to tach "signal".
Ckt16 red/lt green - connect to ign switched "start" and "run" thru a 20ga fusible link.
Ckt32 red/lt blue - Manual trans - connect to clutch safety switch, then to starter relay "S" terminal.
- Automatic trans - connect to starter relay "S" terminal.
Ckt33 white/pink - connect to ign switched "start".
Ckt199 lt blue/yellow - connect to neutral safety switch (connect other terminal of neutral safety switch to connector C-135 Ckt359).
Ckt348 lt green/pink - connect to AC/heater switched "compressor clutch control" leg of heater switch.

Connector C-355 (black)
(2) terminals
No modifications required if connected to Ford compressor using the Ford compressor harness (wiring details shown for referance only).
Ckt57 black - connects to ground side of compressor clutch.
Ckt347 black/yellow - connects to "+" side of AC compressor clutch.
A diode is installed in the Ford compressor clutch harness that allows power to flow only from Ckt347 to Ckt57, but not in the reverse direction.

Connector C-403 (grey)
(8) terminals
Located near the firewall on driver's side in back of strut tower near the self test connectors.
Connections and modifications required as noted below.
Ckt31 white/red - connect to oil pressure dash gauge.
Ckt39 red/white - connect to coolant temp dash gauge.
Ckt258 white/pink - 5.0 GT only
Ckt

Connector C-1984 (grey)
(6) terminals
Located near the firewall on driver's side in back of strut tower.
Connector plug is for diagnostic use only, so no modifications are required (wiring details shown for referance only)
Ckt97 tan/lt green - ground to test fuel pump.
Ckt359 black/white
Ckt382 yellow/black

Connector C-1985 (grey)
(1) terminals
Located near the firewall on driver's side in back of strut tower.
Connector plug is for diagnostic use only, so no modifications are required (wiring details shown for referance only)
Ckt

Connector G-119 (lug)
(1) terminal
Located near the ECA connector in the passenger side kick panel area.
Connector should be attached to chassis ground.
Ckt48 - ignition shield ground

1987 Mustang Alternator Wiring Guide
The back of the alternator has the following terminals, which should be connected to the car as follows...
Ckt38 "B+"
Ckt38 "B+" black/orange - connect both of these terminals to the battery side of the starter relay.
Ckt4 "S"
Ckt4 "S" white/black - connect these two terminals together with a short loop of wire.
Ckt904 "I" lt green/red - connect to ign switch "run" thru the "Alternator Warning Lite".
Ckt36 "A" yellow/white - connect to the battery side of the starter relay thru a 18ga fusible link.