Classic Update Series
*** These are special instructions for connecting your wiring system to a stock instrument cluster. ***
NOTE: If you are using after market gauges, follow the instructions included in the 92965220 Gauge Connection Kit along
with the specific gauge manufacturers instructions for connection of their gauges.
If you are using the original style dash assembly that utilizes a cluster plug and printed circuit board, refer to the text on page 2,
and one of the diagrams on pages 3, 4, or 5, being certain to follow the proper diagram for your application. Use the enclosed
parts and the following information for wire termination, gauge, and lamp connections. Connectors D, E, and F will plug into your
dash harness at branch 4 as noted on the Dash Harness instruction (510541, bag G) set. Connection C will only be used in the
event that you are using an aftermarket electric speedometer.
NOTE: Pontiac never used a factory ammeter in the 1968-72 GTO, Tempest, and Le Mans cars. In the event you wish to
use an aftermarket one, an ammeter IS NOT supported by this kit. We suggest the use of a voltmeter as a better way to
monitor your charging system.
NOTE: The white tach wire included in this cluster kit and continued throughout the dash and engine harnesses should
ONLY BE USED for an aftermarket tach. The stock tach on these Pontiac cars used a self-exciting pulse wire that hooked
up to the negative post on the coil and to the tach terminal on the tachometer without ever using a secondary 12-volt fused
ignition feed wire to excite the tach as most GM cars did. For that reason, Pontiac fused the tach lead circuit on their tach
harnesses with a 1-amp in-line fuse. If your car has a factory tach, AAW recommends that you purchase and install the
correct tach harness for your application as noted below. These Pontiac factory tachs were offered in both hood, and
in-dash design configurations. The cars that utilized a hood-mounted tach also included a lamp connection that plugged into
the original fusebox. In 1968, it plugged onto the lamps circuit of the fusebox. From 1969 thru 1972, that lamp connection
plugged into a full-time accessory source that kept the lamp on anytime the car was running. This was done to keep a heat
source on inside of the tach to help dry any moisture and eliminate the corrosion problems encountered with the original
1968 design. Your new AAW dash harness has a fused accessory source wire that the factory hood tach lamp lead wire will
plug into at branch 1. The remainder of the factory tach harness leads plug onto the tach and coil negative terminals as
original.
Application
1. 1968 hood tach
2. 1968-69 in-dash tach
3. 1969-72 hood tach
4. 1970-71 in-dash tach
5. 1972 in-dash tach
6. 1972 in-dash tach,
with unitized distributor
AAW Part Number
PL88160
FB95974
PL88170
Classic Update Series
FB03708
INSTRUMENT
CLUSTER KIT
68-72 Pontiac GTO
FB20430
FB20431
www.ameriacnautowire.com
page 1
H
bag
856-933-0801
510542
92970634 instruction rev 0.0 12/18/2013
Classic Update Series
Use the following text and the proper diagrams on pages 3, 4, or 5 to complete your dash cluster connections.
CONNECTOR D - Plug this connector into the mating connector B on the dash harness (bag G) and connect wires as follows:
Wire Color
Function
Stock Circuit Board Connection
DK BLUE
Right Turn Lamp
Route this wire to the circuit board and cut to length. Install terminal C, and plug into connector A in the appropriate location as shown on pages 3 thru 5
depending on your year and application.
LT BLUE
Left Turn Lamp
Route this wire to the circuit board and cut to length. Install terminal C, and plug into connector A in the appropriate location as shown on pages 3 thru 5
depending on your year and application.
LT GREEN
Hi Beam Lamp
Route this wire to the circuit board and cut to length. Install terminal C, and plug into connector A in the appropriate location as shown on pages 3 thru 5
depending on your year and application.
DK GREEN
Temperature Sender
Route this wire to the circuit board and cut to length. Install terminal C, and plug into connector A in the appropriate location as shown on pages 3 thru 5
depending on your year and application.
DK BLUE
Oil Pressure Sender
Route this wire to the circuit board and cut to length. Install terminal C, and plug into connector A in the appropriate location as shown on pages 3 thru 5
depending on your year and application.
GREY
Instrument Lamps
(2 Locations) Route these wires to the circuit board and cut to length. Install terminal C, and plug into connector A in the appropriate locations as shown on
pages 3 thru 5 depending on your year and application.
TAN
Fuel Sender
Route this wire to the circuit board and cut to length. Install terminal C, and plug into connector A in the appropriate location as shown on pages 3 thru 5
depending on your year and application.
CONNECTOR E - Plug this connector into the mating connector A on the dash harness (bag G) and connect wires as follows:
Wire Color
Function
Stock Circuit Board Connection
TAN
Brake Lamp
Route this wire to the circuit board and cut to length. Install terminal C, and plug into connector A in the appropriate location as shown on pages 3 thru 5
depending on your year and application.
PINK
12v Ignition
Route this wire to the circuit board and cut to length. Install terminal C, and plug into connector A in the appropriate location as shown on pages 3 thru 5
depending on your year and application.
(OPTIONAL installation with aftermarket tach) Route this wire to the circuit board and cut to length. Double it with the cut off portion, install terminal B, and
plug into connector A in the appropriate location as shown on pages 3 thru 5. Route the loose end of this pink wire over to your aftermarket tach and connect
it to the tach power terminal.
BLACK
Ground
This wire is really only necessary in an aftermarket gauge cluster application, but it will not hurt to use it as extra ground in a stock application. Plug this
loose wire into connector E as shown on pages 3 thru 5 maintaining color continuity with the black “ground” wire on the mating dash connector. Route this
wire to the circuit board area and cut to length. Install a ring terminal from the 92965220 loose piece terminal kit, and attach the wire to the metal backing of
the stock gauge cluster.
BROWN
Alt. Ign.
This wire is only used with a factory dash cluster and it is for your generator warning lamp. Plug this loose wire into connector E as shown on pages 3 thru 5
maintaining color continuity with the brown “alternator ignition” wire on the mating dash connector. Route this wire to the circuit board and cut to length.
Install terminal C, and plug into connector A in the appropriate location as shown on pages 3 thru 5 depending on your year and application.
CONNECTOR F - Plug this connector into the mating connector C on the dash harness (bag G) and connect wires as follows:
This connector is only used when using an aftermarket electronic speedometer. Follow the manufacturer’s instructions when installing these wires. If you are
using a stock or mechanical aftermarket speedometer, you may discard this connector and wires, as they will not be used for your installation. See page 6 of
this instruction sheet for more detailed information regarding the colors of the wires and their installation.
LOOSE WIRE
Wire Color
Function
Tach Connection
WHITE
Tachometer
NOTE: This wire will only be used with an aftermarket tach. If your car has a factory tach, contact AAW to order the proper factory tach harness for your
year and application as outlined on page 1 of this instruction set. Plug this loose wire into connector D as shown on pages 3 thru 5 maintaining color
continuity with the white "TACH" wire on the mating dash connector. Route the other end of this wire to the tach, cut to length, and install onto your tach
pulse terminal.
C
page 2
B
A
www.ameriacnautowire.com
856-933-0801
92970634 instruction rev 0.0 12/18/2013
Classic Update Series
gray (dash lights)
brown (alt ign)
dk green (temp)
dk blue (RH turn)
lt green (hi beam)
6
AFTERMARKET
TACH ONLY
5 4
Use this sheet for all
1968-71 GTO, Tempest,
and Le Mans with
Factory Gauges
3 2 1
A
(optional)
7 8 9 10 11 12
tan (gas gauge)
gray (dash lights)
lt blue (LH turn)
tan (brake warning lamp)
pink (12V ign)
dk blue (oil pressure)
C (or B on the pink
wire if using an
aftermarket tach)
to back of
cluster housing
(ground)
white
black
plug white tach
wire in HERE
(optional)
x
CONNECTOR D
page 3
All connectors are
depicted looking
into the open end of
the connectors,
NOT wire entry end.
plug brown alt.
ign. wire in HERE
plug black ground
wire in HERE
xxxx
CONNECTOR E
92970634 instruction rev 0.0 12/18/2013
Classic Update Series
gray (dash lights)
dk green (temp)
brown (alt ign)
dk blue (RH turn)
lt green (hi beam)
6
AFTERMARKET
TACH ONLY
5 4
Use this sheet for all
1972 GTO, Tempest,
and Le Mans with
Factory Gauges
3 2 1
A
(optional)
7 8 9 10 11 12
tan (gas gauge)
gray (dash lights)
lt blue (LH turn)
tan (brake warning lamp)
pink (12V ign)
dk blue (oil pressure)
C (or B on the pink
wire if using an
aftermarket tach)
to back of
cluster housing
(ground)
white
NOTE: This system
does not support
the use of the
factory “Seat Belt
Warning Lamp”.
black
plug white tach
wire in HERE
(optional)
x
CONNECTOR D
page 4
All connectors are
depicted looking
into the open end of
the connectors,
NOT wire entry end.
plug brown alt.
ign. wire in HERE
plug black ground
wire in HERE
xxxx
CONNECTOR E
92970634 instruction rev 0.0 12/18/2013
Classic Update Series
gray (dash lights)
tan (gas gauge)
dk green (temp)
dk blue (RH turn)
lt green (hi beam)
6
AFTERMARKET
TACH ONLY
5 4
Use this sheet for all
1968-72 GTO, Tempest,
and Le Mans with
Factory Warning Lamps
3 2 1
A
(optional)
7 8 9 10 11 12
brown (alt ign)
gray (dash lights)
lt blue (LH turn)
tan (brake warning lamp)
pink (12V ign)
dk blue (oil pressure)
C (or B on the pink
wire if using an
aftermarket tach)
to back of
cluster housing
(ground)
white
black
plug white tach
wire in HERE
(optional)
x
CONNECTOR D
page 5
All connectors are
depicted looking
into the open end of
the connectors,
NOT wire entry end.
plug brown alt.
ign. wire in HERE
plug black ground
wire in HERE
xxxx
DCONNECTOR E
92970634 instruction rev 0.0 12/18/2013
TYPICAL AFTERMARKET GAUGE CONNECTIONS
(BLADE TYPE CONNECTIONS SHOWN)
LEFT TURN IND
RIGHT TURN IND
HIGH BEAM IND
dk blue
(RH turn ind)
lt green
(hign beam ind)
lt blue
(LH turn ind)
Below are some general instructions for hooking up an electric
speedometer. This connector and these instructions will ONLY be used
in the event that you are utilizing an aftermarket electric speedometer.
If your car does NOT have an electric speedometer, this connection
will NOT be used and should not be plugged onto your dash harness.
It is best to consult the speedometer manufacturer’s instructions if you
have any questions.
15
11
14
TURN SIGNAL AND HI-BEAM LAMP CONNECTIONS
black/white
(speedo ground)
401
yellow
(VSS ground)
purple/white
(VSS power)
pink/white
(speedo power)
402
Oil
Tachometer
GRD
I
I
GRD
VSS GRD
I
S
SPDO GRD
S
S
12v I
pink
(12V ignition)
Speedometer
black
(ground)
Water
GRD
S
S
black
(ground)
dk green
(temperature)
gray
(dash lights)
Water
page 6
Fuel
GRD
I
pink
(12V ignition)
dk blue
(oil pressure)
white
(tach - coil)
I
tan
(fuel gauge)
Volts
Tachometer
Speedometer
39
LAMP CONNECTIONS
8
Oil
black
(ground)
Connect to VSS input on speedometer.
Connect to 12V power on speedometer.
Speedo Power Connect to 12v power on speedometer.
NOTE: This wire will double onto the
same stud as the purple/white VSS
power wire from above.
black/
white
pink/
white
31
35
gray
(dash lights)
VSS Pulse
30
121
GAUGE CONNECTIONS
Purple
Pink/White
139
Instrument Cluster Lead Wires
Volts
Connect to VSS “-” on speedometer.
Black/White Speedo Ground Connect to ground on speedometer.
400
pink
(12V ignition)
GRD
VSS Ground
Purple/White VSS Power
151
purple
(VSS signal)
Yellow
All connectors are
depicted looking
into the open end of
the connectors,
NOT wire entry end.
purple
purple/
white
yellow
yellow
A B C D E F
Classic Update Series
TYPICAL ELECTRIC
SPEEDO CONNECTIONS
x
Fuel
150
CONNECTOR F
92970634 instruction rev 0.0 12/18/2013
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