Revised September 13, 2013
Wiring the Instrument Cluster
Speedometer & Tachometer Wiring
1)
Always disconnect the vehicle battery before wiring any gauge.
2)
Connect a +12VDC switched power source to the
Pink
wire of the
speedo / tach harness.
3)
Connect a good chassis ground to the
Black
wire of the speedo / tach
harness.
4)
Connect the speed signal to the
purple
wire of the speedo / tach
harness.
a. SN16 & SN16F pulse signal generator signal
i. Connect the
white
wire to the speedo / tach harness purple
wire.
ii. Connect the
black
wire to a good chassis ground
iii. Connect the
red
wire to speedo / tach harness red wire.
b. Transmission vehicle speed sensor signal
(2-wire)
i. Connect one of the vehicle speed sensor wires to the
speedo / tach harness purple wire.
ii. Connect the remaining vehicle speed sensor wire to the
same ground as the speedo / tach harness black wire.
iii. The vehicle speed sensor wires are interchangeable, it
doesn’t matter which one is connected to the black or purple
speedo / tach harness wires.
iv. Insulate any exposed wire on the red wire of the speedo /
tach harness. This wire is not used with this speed signal.
c. PCM / ECM speed signal
(computers)
i. Connect the speed signal wire to the speedo / tach harness
purple wire.
ii. A signal filter (part number SN79) is sometimes needed in
cases where the signal has picked up interference.
iii. Insulate any exposed wire on the red wire of the speedo /
tach harness. This wire is not used with this speed signal.
5)
Connect the tachometer signal to the
white
wire of the speedo / tach
harness.
(see table 2: tachometer signal sources)
6)
Connect one wire (
either
) of the pushbutton to the brown wire of the
speedo / tach harness.
a. Connect the other wire of the pushbutton to a good chassis ground.
7)
The
grey
,
blue / white
,
purple / white
and
green / white
wires of the
speedo / tach harness are not used in this application.
