Auto Meter 6387 User Manual

INSTALLATION INSTRUCTIONS

DIGITAL TACH/SPEEDO COMBO

2650-1224-00

QUESTIONS:

If after completely reading these instructions you have questions regarding the operation or installation of your instrument(s),

please contact Auto Meter Technical Service at 815-899-0801.

You may also email us at [e-mail].

Additional information can also be found at http://www.autometer.com/tech_faq.aspx

Innovative E Z View™ Display System

Maximizes readability

Minimizes distracting High Speed digit changes

General Information

This instrument utilizes a single LCD to display odometer and two trip odometer mileages. Press the Trip button on the dial window to cycle between odometer,
Trip 1, and Trip 2 displays on the LCD. Pressing and holding the Trip button for more than 2 seconds while viewing either Trip display will reset the trip currently
being displayed. The odometer cannot be reset.

NOTE: The odometer on the speedometer portion of this instrument will show some mileage less than 5 miles (8km).
This is a result of factory testing to ensure optimum quality.

TIP: Auto Meter always recommends performing the calibration process for best speedometer accuracy.

Speedometer Senders:

The electronic speedometer in this instrument is designed to operate with an electrical speed sender. The speed sender signal range must be between 500
and 400,000 pulses/mile (310 and 248,500 pulses/km). Any speed sender or electronic module that meets the following two conditions can be used:

1. Pulse rate generated is proportional to vehicle speed.

2. Output voltage within the ranges listed below:
a. Hall effect sender, 3 wire (5 to 16V)
b. Sine wave generator, 2-wire (1.4 VAC min.)
c. 5v Square Wave (CMOS)

Recommended – Auto Meter Hall effect sender, 3 wire, 16 pulses/revolution
5291 Standard 7/8” – 18 Thread
5292 Ford, plug in

Installation Tips

1. A 12 V power source MUST be used to power this speedometer. A 12V motorcycle battery is a good alternative for cars without batteries.
A battery with minimum 5 amp hour rating is recommended.

2. Wherever possible, solder wire connections and avoid crimp-type connectors. This will minimize loose connections that could cause problems later.

3. Make sure you have a good ground to engine and battery negative terminal.

4. Wire installations should be neat and tied down to prevent tugging and fraying of wires at connections.

Sine

Wave

2 Wire

Sender

Sine

Wave

2 Wire

Sender

V.S.S.

PCM,

ECM,

COMPUTER

IF NO

COMPUTER

COMPUTER
CONTROLLED,
TAP ONTO
HI-SIDE V.S.S.
SIGNAL

GND

LO

HI

HI

OR

IF

LO

Remove cap for cruise

control cable, otherwise

leave cap installed.

GND

3-Wire Sender

BLACK

Orange

White

Back of gauge

12V DASH
LIGHTING

Dims Digital Display

When Power is Applied.

VSS to ECM

(see Note)

FUSE

(SEE CAUTION)

12V

IGNITION

SWITCH

(OR)

Red

Wiring

Use 20 AWG stranded or
heavier wire for hook-up

CAUTION!

As a safety precaution, the power wire to this product
should be fused before connecting it to the positive
(+) side of the 12 VDC battery. We recommend using
a 1 Amp fuse.

Most OEM style or Factory Installed,

2 wire senders (Sine Wave)

IMPORTANT

When using most OEM/factory installed
(2 wire) senders, you must calibrate the

speedometer before it will function properly.

GROMMET IN

FIREWALL

VIOLET

RED

GREEN

BLACK

RED

GREEN

EARLY MODEL IGNITION

VIOLET

BLACK

BLACK

NOTE: The speedometer signal output

terminal (VSS) produces a +5
volt DC Square wave signal.
This signal may be able to
be used as a VSS signal with
some OEM and aftermarket
ECM’s and cruise control units.

GOOD ENGINE GROUND

OR

TACH
TERMINAL

ELECTRONIC IGNITION

WARNING

Warranty will be void if connected to
coil when using an aftermarket ignition
box such as, but not limited to products
from the following manufacturers: MSD,
Crane, Jacobs, Mallory, Holley, Etc..
Prior to installation of your tachometer,
check with the ignition box manufacturer
for recommended tachometer
signal location.

Use 20 AWG stranded or
heavier wire for hook-up

Mounting

1. Mount this instrument in a 3 3/8" dia. hole.

2. Cut a 3/8" dia. hole in the firewall for the speedometer wires. Place a rubber grommet
in the hole and route the wires through the grommet to the engine compartment.

3. Connect the speedometer wires as shown in the wiring sections.

4. Secure the speedometer to the dashboard using the provided bracket and hardware.

Auto Meter Hall-Effect senders (Square Wave)

- Models 5291 (standard 7/8-18 thread) &
5292 (Ford Plug in Sensor), 3 wire sender,
cruise.

33/8" Models

1

2

/8"

11

3

/32"

3¾"