Auto Meter 4379 User Manual

2650-1465-00

INSTALLATION INSTRUCTIONS

21/16" WIDEBAND AIR/FUEL RATIO

®

MONITOR - STREET

Installation

1. Disconnect the negative (-) battery cable.

2. Gauge can be mounted in a 21⁄16” dia. hole with brackets
supplied. Gauge can also be mounted in Auto Meter
Mounting Cup, or in Auto Meter Gauge Works Pods.

3. Wire gauge as shown.

Red Wire (Power):
Connect to a fused and switched 12V positive source

that is turned on and off with the ignition switch. Place a 3
amp automotive fuse (available commercially) in line with
this connection to protect your gauge. It is recommended
that vehicles without alternators connect this wire to a
separate switch or direct to the vehicle’s master cutoff
switch. (See Heater Control Mode Section)

WARNING

Sender Will Get Very Hot During Operation.

Blue

Black Wire (Ground):

Connect to good engine ground.

White Wire (Lighting):

Connect to dash lighting dimmer control.

Brown Wire (Heater Override):

Connect to a normally open switch. Connect the

other switch terminal to battery positive (+).

Blue Wire (Optional Data Logger Signal Output):

Connect to signal input(+) or Engine Management System

or Data Acquisition unit.

Black Wire (Optional Data Logger Signal Ground):
Connect to signal input(-) on Engine Management system

or Data Acquisition Unit.

Red

Fuse

Brown

12V Ignition

Black

Switch

Black

12V Dash Lighting

or Auto Meter 9114

Dimmer Module

White

Normally

Open Switch
(Optional)

Good

Engine Ground

_

+

Mounting Sensor

The heated oxygen sensor comes with a stainless steel weld-in bung,
plug, and wiring harness. The oxygen sensor should be installed
as close to the cylinder head as is reasonably possible so that the
sensor reaches operating temperature quickly. If long tube headers
are used, the oxygen sensor should be installed in the collector. If
cast iron manifold(s) or shorty headers are used, install the sensor in
the pipe just below the manifold. In multi-bank applications mounting
in the left or right side is acceptable. Turbocharged applications
should have sensor installed 4-5" after turbo on the down pipe.

Auto Meter recommends welding supplied
stainless steel bung with a TIG welder.

1. The exhaust pipe in front of the sensor should not contain any pockets, projections, protrusions, edges, flex-tubes etc. to avoid
accumulation of condensation. A downwards slope of the pipe is recommended. If the exhaust pipe is parallel to the ground, the
sensor must be installed in the top half of the pipe to avoid damage to due to condensation

2. Tightening torque: 30-44 ft Ibs.

3. Avoid excessive heating of the sensor cable. Route sensor cable away from exhaust pipe.

4. The maximum temperature of the sensor on the outside of the exhaust fitting should not exceed 900o F.

The Air / Fuel Ratio Monitor is intended
for use with unleaded gasoline.

NOTE: OK for use with Nitrous Oxide.

NOTE: Stoichiometric Air / Fuel Ratio is the chemically correct

ratio where theoretically all of the oxygen and all of the
fuel are consumed. The mixture is neither rich or lean.

Heater Control Mode:

Red

Green

Amber

All O2 sensors must be heated before an accurate signal is produced. Potential sensor damage can occur if the gauge begins to heat the
sensor before the engine is running due to condensation that forms on the sensor tip and in the exhaust. To accommodate this, an internal
trigger within the gauge will automatically begin heating the sensor when 12.5 volts or higher is seen on the Red wire (“Normal” operating
mode). While the gauge does not require 12.5 volts to operate (12 volts will suffice), this voltage is used to indicate to the gauge that the
engine is running, as most regulated charging systems will maintain 14 volts or higher. Once the gauge sees 12.5 volts, it will begin
heating the sensor and transition from (---) to a 20 second countdown on the seven-segment display. When the countdown is complete,
the sensor is heated, and the gauge will begin reading air/fuel ratio in real-time.

Sensor Heater:

In applications where a standard charging system is not used (vehicles without a regulated alternator, for example) there is an override
available that will allow sensor heating to occur without the gauge reading a 12.5 volt trigger. To use this feature, connect the Brown wire
from the gauge harness to one terminal of a normally open switch. Connect the second terminal of the switch to battery positive (+), or to
the keyed power from the ignition switch. To turn on the sensor heater, turn the normally open switch on after starting engine. The switch
can be turned on momentarily or left on at all times.

Warning:

Fouling and/or permanent damage to the oxygen sensor
over time will result if used with any of the following:

 •Leadedgasolineandfueladditivescontaininglead
 •2cyclegasoline(gas/oilmix)
 •DieselFuel
 •Nitromethane
 •Excessivelyrichmixtures

If the Air/Fuel Ratio Monitor responds sluggish, the oxygen
sensor is probably partially fouled and should be replaced.

LED Chart

Lean Range Four red LED’s

Stoichiometric Range Eight green LED’s

Rich Range Four amber LED’s

Data Logger Output Range:

The Auto Meter Wideband Air/Fuel gauge has a signal output for supplying information to a Data Logger or engine management system.
The signal provided is a linear 0-4 volts output. 0 volts out equals 10.0 Air/Fuel Ratio, 4 volts out equals 17.0 Air/Fuel Ratio.

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. 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.

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

© 2009 Auto Meter Products, Inc. 2650-1465-00 11/02/09

Email us at [e-mail]

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

SERVICE

http://www.autometer.com