CHECK ENGINE INDICATOR INPUTBRAKE SYSTEM/PARKING BRAKE WARNING INPUTHIGH BEAM INDICATOR INPUTLEFT TURN SIGNAL INDICATOR INPUTRIGHT TURN SIGNAL INDICATOR INPUT4 WHEEL DRIVE INDICATOR INPUT1-WIRE GEAR INDICATOR INPUT (FROM GSS UNIT)WAIT TO START INDICATOR INPUTCRUISE ENGAGED INDICATOR INPUT

FUEL LEVEL SENSOR GROUND OUTPUTFUEL LEVEL SENSOR INPUT

NOT TYPICALLY USED

OIL PRESSURE SENSOR GROUND OUTPUTOIL PRESSURE SENSOR INPUT

OIL PRESSURE SENSOR POWER OUTPUT

WATER TEMPERATURE SENSOR GROUND OUTPUTWATER TEMPERATURE SENSOR INPUT

NIGHT DIMMING ADJUSTMENT GROUND OUTPUTNIGHT DIMMING ADJUSTMENT INPUT

SPEED SELECT SWITCH INPUT SW1TACH SELECT SWITCH INPUT SW2

2000 PPM SPEED SIGNAL OUTPUTVEHICLE SPEED SENSOR GROUND OUTPUT

VEHICLE SPEED SENSOR SIGNAL INPUTVEHICLE SPEED SENSOR POWER OUTPUT

RPM WARNING/SHIFT OUTPUTTACHOMETER INPUT

+12 VOLT ACCESSORY POWER INPUT

MAIN CHASSIS GROUND INPUT

STATUS LED

TO DISPLAY CONNECTOR(Doesn't matter which one)

ACC. POWER CONST. POWER GROUND

TACH WARN

SPD + SPD SND SPD - SPD OUT

SW2 (-) SW1 (-)

ADJ SND ADJ -

WTR SND WTR -

OIL + OIL SND OIL -

RESERVED (SEE MANUAL)

FUEL SND FUEL -

WAIT (+) CRUISE (-)

GEAR (1 WIRE) 4x4 (-)

RIGHT (+) LEFT (+) HIGH (+)

BRAKE (-) CHECK ENG (-)

VHX

CO

NTR

OL B

OX

CA

BLE

AU

X.

I/O

DISP

LAY

DIM (+) NIGHT DIMMING INPUT

+12 VOLT CONSTANT POWER INPUT

CONTROL BOX DIAGRAM

Digital Gauge Cluster (1987-93)Basic Wiring Guide

1

2

3

4

5

6

7

14

13

12

11

10

9

8

8

9

10

11

12

13

14

7

6

5

4

3

2

1

3 (LG/W)

932 (GY/W)

39 (R/W)

640 (R/Y)

977 (P/W)

794 (LB)

640 (R/Y)

31 (W/R)

57 (BK)

29 (Y/W)

19 (LB/R)

2 (W/LB)

450 (DG/LG)

904 (LG/R)

640 (R/Y)

16 (R/LG)

57 (BK)

19 (LB/R)

11 (T/Y)

608 (BK/Y)

41 (BK/LB), 658 (PK/LG)

208 (GY)

PIN NUMBER CIRCUIT CIRCUIT FUNCTION CIRCUIT CIRCUIT FUNCTIONPIN NUMBER1234567891011121314

123456789

1011121314

LG/WGY/WR/WR/YP/WLBR/YGYBK/LB, PK/LGBK/YT/YNOT USEDLB/RBK

LEFT TURN INDICATORHI BEAM INDICATORCOOLANT TEMP. SENDER FEED12V INPUT 1CHECK BRAKE INDICATOR FEEDLOW COOLANT INDICATOR FEED12V INPUT 1CHECK OIL INDICATOR FEEDMALFUNCTION INDICATOR LAMP (MIL) FEEDAIR BAG INDICATORTACHOMETER FEEDNOT USEDILLUMINATION FEEDGROUND

NOT USEDR/LGNOT USEDNOT USEDNOT USEDNOT USEDR/YW/RBKY/WLB/RW/LBDG/LGLG/R

NOT USEDIGNITION SWITCHNOT USEDNOT USEDNOT USEDNOT USED12V INPUT 1OIL PRESSURE GAUGE FEEDGROUNDFUEL GAUGE FEEDILLUMINATION FEEDRIGHT TURN INDICATORFASTEN BELTS INDICATORBATTERY INDICATOR FEED

C250INSTRUMENT CLUSTER

FORD MUSTANG WIRING DIAGRAMFOR 1990-1993 INSTRUMENT CLUSTER

FORD MUSTANG WIRING DIAGRAMFOR 1990-1993 INSTRUMENT CLUSTER

C251INSTRUMENT CLUSTER

90-93 Instrument Cluster Connector Wiring

LH Connector (C250)

Pin 1 (LG/W) - Connect to "LEFT (+)" on the control boxPin 2 (GY/W) - Connect to "HIGH (+) on the control boxPin 4 (R/Y) - Connect to "ACC POWER" on the control boxPin 5 (P/W) - Connect to "BRAKE (-) on the control boxPin 9 (PK/LG) - Connect to "CHECK ENG (-) on the control boxPin 11 (T/Y) - Connect to "TACH" on the control boxPin 13 (LB/R) - Connect to "DIM (+) on the control box

RH Connector (C251)

Pin 10 (Y/W) - Connect to "FUEL SND" on the control boxPin 12 (W/LB) - Connect to "RIGHT (+)" on the control boxPin 2 (R/LG) & Pin 14 (LG/R) - Splice the provided alternator load resistor between these to circuits. The orientation of the load resistor harness does not matter.

1

2

3

4

5

6

7

14

13

12

11

10

9

8

8

9

10

11

12

13

14

7

6

5

4

3

2

1

3 (LG/W)

932 (BK)

39 (R/W)

640 (R/Y)

977 (R/LG)

794 (LG/R)

640 (P/W)

208 (Y/BK)

57 (W/R)

608 (Y/W)

11 (R/Y)

2 (BK)

19 (DG/LG)

57 (LB/R)

640 (PK/Y)

794 (Y/BK)

932 (R/W)

39 (P/O)

3 (GY)

57 (LG/BK)

19 (W/LB)

11 (DG/Y)

608 (GY)

208 (BK/L)

PIN NUMBER CIRCUIT CIRCUIT FUNCTION CIRCUIT CIRCUIT FUNCTIONPIN NUMBER123456789

1011121314

123456789

1011121314

LG/WBKR/WR/YR/LGLG/RP/WBK/LNOT USEDGYDG/YNOT USEDW/LBLG/BK

LEFT TURN INDICATORGROUNDTEMP. TO SENDERWARNING LAMPS FEEDIGNITION SWITCH TO COIL-BATTIGNITION SWITCH TO ALT REGBRAKE WARNING SIGNAL LIGHTWARNING LAMP PROVE OUT 2NOT USEDLOW OIL LEVEL TO SIGNALTACHOMETER FEEDNOT USEDRIGHT TURN SIGNAL INDICATORHIGH BEAM INDICATOR

GYR/WP/ONOT USEDNOT USEDY/BKPK/YY/BKW/RY/W, LBR/YBKDG/LGLB/R

LOW OIL INDICATOR LAMPSWITCH TO WARNING LAMPNOT USEDNOT USEDNOT USEDSIGNAL UNIT TO FUEL SIGNAL RELAYWASHER FLUID LOW INDICATORSIGNAL UNIT LAMP TO FUEL SIGNAL RELAYOIL PRESSURE SIGNALFUEL GAUGE FEEDWARNING LAMPS FEEDGROUNDCOOLANT TEMP RELAY FEEDINSTRUMENT PANEL LAMPS FEED

C250INSTRUMENT CLUSTER

FORD MUSTANG WIRING DIAGRAMFOR 1987-1989 INSTRUMENT CLUSTER

C251INSTRUMENT CLUSTER

87-89 Instrument Cluster Connector Wiring

LH Connector (C250)

Pin 1 (LG/W) - Connect to "LEFT (+)" on the control boxPin 5 (R/LG) & Pin 6 (LG/R) - Splice the provided alternator load resistor between these to circuits. The orientation of the load resistor harness does not matter.Pin 7 (P/W) - Connect to "BRAKE (-) on the control boxPin 8 (T) - Connect to "CHECK ENG (-) on the control boxPin 11 (DG/Y) - Connect to "TACH" on the control boxPin 13 (W/LB) - Connect to "RIGHT (+)" on the control boxPin 14 (LG/BK) - Connect to "HIGH (+) on the control box

RH Connector (C251)

Pin 10 (Y/W) - Connect to "FUEL SND" on the control boxPin 11 (R/Y) - Connect to "ACC POWER" on the control boxPin 14 (LB/R) - Connect to "DIM (+) on the control box

87-93 VSS (Vehicle Speed Sensor) WiringThe factory VSS + (feed) wire can be found behind the LH (driver side) kick panel. The factory wire color from the sensor is DG/W. For 91-93 models, the wire changes color on the female side of the connector to GY/BK. There are two wires occupying this location. One wire runs to the Speed Control Amplifier and the other wire runs to the PCM. Either wire can be used for VSS + (feed). Connect to "SPD SND" on the control box.

Please reference the main installation guide for more information and control box troubleshooting.

WATCH THE INSTALLVIDEO HERE!