Auto Meter 3674 User Manual

INSTALLATION INSTRUCTIONS

12V BATTERY

FULL SWEEP ELECTRIC PRESSURE GAUGES

2650-1134-00 Rev. B

Use teflon sealing compound sparingly
where symbol indicates. (Tape not
recommended on these threads.)

CAUTION!

As a safety precaution, the
+12V terminal of this product
should be fused before
connecting to the 12V ignition
switch. We recommend using
a 1 Amp, 3AG fast-acting type
cartridge fuse (Littlefuse
312 001 or an equivalent).

NOTE: When the ignition is off the pointer may not always
rest at zero.

®

#

SENDER

OPTIONAL

SLIT TUBING

RECOMMENDED
(AVAILABLE AT MOST
HARDWARE STORES)

WIRING

HARNESS

+12v DASH
LIGHTING

GOOD
ENGINE
GROUND

FOR INTERNAL LED

LIT INSTRUMENTS

(SEE CAUTION LEFT)

WHITE

FUSE

+12v DASH
LIGHTING

GROMMET

FIREWALL

+12v CONNECTION

(for standard incandescent

WHITE

BLACK

lit instrument)

RED

BLACK

GOOD ENGINE
GROUND

Installation - Fuel & Oil Pressure

WARNING: The fuel system is pressurized and often retains this

pressure for an extended period of time. Properly vent
your fuel system before installing the fuel pressure sender.
If you are not familiar with the proper method of venting,
you MUST have this done by an experienced mechanic.

1. Check that you have all parts required for installation, and the
engine is cool.

2. Disconnect the negative (-) battery cable.

3. Gauge mounts in a 2

1

for 2

⁄16” gauges. Use supplied brackets and nuts to secure

5

⁄8” hole for 25⁄8” gauges, and a 21⁄16” hole

gauge to dash.

4. Drill 1” diameter hole where wires pass through sheet metal
(such as firewall) and install rubber grommet provided.
(Grommet will require slit.)

5. Connect the white wire to dash lighting or switchable 12v light source,
the red wire to switched +12V source and the black wire to ground.
(see diagram for details)

CAUTION: If you will be working with the fuel system, take care to

insure no sparks or flames occur. Do not smoke while installing the
fuel pressure sender.

Installation - Nitrous Pressure

1. Check that you have all parts required for installation, and the
engine is cool.

2. Disconnect the negative (-) battery cable.

3. Gauge mounts in a 2

1

for 2

⁄16” gauges. Use supplied brackets and nuts to secure

gauge to dash.

4. Drill 1” diameter hole where wires pass through sheet metal
(such as firewall) and install rubber grommet provided.

5. Connect the white wire to dash lighting or switchable 12v light
source, the red wire to switched +12V source and the black wire
to ground. (see diagram for details)

6. Make sure the nitrous bottle valve is closed and there is no

pressure in the system.

7. Remove the main nitrous feed line from the bottle or the nitrous
solenoid. Install the in-line gauge adapter (e.g. NOS part #16770
or #16771) either on the nitrous bottle or nitrous solenoid. Re­ install the main nitrous feed line. Install pressure sender and
wiring harness. For mounting off bottle in rear of car, use 20’
sender harness model 5223.

8. Open the nitrous bottle valve.
NOTE: Test all fittings and hoses for any leakage. If any leaks
are detected, determine the cause of the leak and
repair. Do not operate vehicle if any leaks are detected.

5

⁄8” hole for 25⁄8” gauges, and a 21⁄16” hole

6. [For oil pressure gauge installation, an optional
is included. For fuel pressure gauge, install the

1

⁄4” NPT adapter

1

⁄8” NPT pressure

sender into the fuel system (See caution below). For Ford fuel injected
applications with a Schrader valve in the fuel rail, use adapter 3280
between the fuel rail and pressure sender.]

If unit is to be installed on a high vibration application such as a full race

engine or engine capable of high RPM, it is strongly recommended that
the sender be remote mounted to either the fenderwell or firewall, to
insulate from vibration. Failure to remote-locate pressure senders

on such an application could result in gauge failure and potential
damage to vehicle and/or operator injury. Braided stainless steel lines

are sold separately by Auto Meter, and can be used to accomplish this.

8. Reconnect negative (-) battery cable.

NOTE: Test all fittings and hoses for any leakage. If any leaks are

detected, determine the cause of the leak and repair. Do not
operate vehicle if any leaks are detected.

ATTENTION DODGE DIESEL OWNERS: If using on ‘98-’02 (some

‘03) Cummins diesels, you MUST use #3227 Line Kit and #3279
restrictor to prevent premature failure of sender. Failure to do so will
void warranty.

WARNING: Not compatible with Nitromethane, Methanol,
or 100% MTBE.

Use teflon sealing
compound where
symbol indicates.
(Tape not
recommended on

Gauge Adapter

these threads.)

In-Line

Check with
your nitrous kit
manufacturer
for availability
of this adapter.

Main Nitrous Feed

Nitrous

Solenoid

IN

OUT

Nitrous

Bottle

Installation - Brake Pressure

1. Check that you have all parts required for installation, and the
engine is cool.

2. Disconnect the negative (-) battery cable.

3. Gauge mounts in a 2
hole for 2

1

⁄16” gauges. Use supplied brackets and nuts to

secure gauge to dash.

4. Drill 1” diameter hole where wires pass through sheet metal
(such as firewall) and install rubber grommet provided.

5. Connect the white wire to dash lighting or switchable 12V light
source, the red wire to switched +12V source and the black
wire to ground. (see diagram for details)

6. If you are not familiar with proper brake system bleeding
procedures, do not install this gauge. Have a qualified
mechanic do it for you.

7. Locate a

1

⁄8”-27 NPT port in your brake system in a location

where you would like to measure brake pressure. If no port is
available, you will need to install a tee fitting in the brake line
you want to measure. Only use fittings that are approved for

use in brake systems.

8. Install the pressure sensor in the
Teflon thread sealing compound.

9. Bleed the brake system using standard brake bleeding
procedures.

Again, if you are not familiar with proper brake system

bleeding procedures, do not install this gauge. Have a
qualified mechanic do it for you.

Note: Install sensor with electrical connector

facing down to allow any air in the sensor
to escape during bleeding.

5

⁄8” hole for 25⁄8” gauges, and a 21⁄16”

1

⁄8”-27 NPT port using a

Teflon Sealing compound

Brake Fitting

Brake Line

1

⁄8” NPT Thread on Sensor

Pressure Sensor

Power-Up

The pointer will move backward to the stop pin and then move to the zero box. This procedure is an auto-calibration
function and is performed on every power-up. While this test is being performed, the gauge may make a clicking
sound. This is normal.

For service send your product to Auto Meter in a well packed shipping carton. Please include a note explaining what the problem is along with your phone number. Please specify when you need the product
back. If you need it back immediately mark the outside of the box “RUSH REPAIR,” and Auto Meter will service product within two days after receiving it. ($10.00 charge will be added to the cost of “RUSH
REPAIR.”) If you are sending product back for Warranty adjustment, you must include a copy (or original) of your sales receipt from the place of purchase.

12 MONTH LIMITED WARRANTY

Auto Meter Products, Inc. warrants to the consumer that all Auto Meter High Performance products will be free from defects in material and workmanship for a period of twelve (12) months from date of the
original purchase. Products that fail within this 12 month warranty period will be repaired or replaced at Auto Meter’s option to the consumer, when it is determined by Auto Meter Products, Inc. that the product
failed due to defects in material or workmanship. This warranty is limited to the repair or replacement of parts in the Auto Meter instruments. In no event shall this warranty exceed the original purchase price of
the Auto Meter instruments nor shall Auto Meter Products, Inc. be responsible for special, incidental or consequential damages or costs incurred due to the failure of this product. Warranty claims to Auto Meter
must be transportation prepaid and accompanied with dated proof of purchase. This warranty applies only to the original purchaser of product and is non-transferable. All implied warranties shall be limited in
duration to the said 12 month warranty period. Breaking the instrument seal, improper use or installation, accident, water damage, abuse, unauthorized repairs or alterations voids this warranty. Auto Meter
Products, Inc. disclaims any liability for consequential damages due to breach of any written or implied warranty on all products manufactured by Auto Meter.

SERVICE

FOR SERVICE SEND TO: AUTO METER PRODUCTS, INC. 413 W. Elm St., Sycamore, IL 60178 USA [phone]

© 2008 Auto Meter Products, Inc.

Email us at [e-mail]

http://www.autometer.com

The Super Bezel is a registered trademark of Auto Meter Products, Inc.

2650-1134-00 Rev. B 3/14/08