Auto Meter 7570 - Manual

NOTE: OK for use with Nitrous Oxide.
INSTALLATION INSTRUCTIONS
2
1
/
16
" WIDEBAND AIR/fUEL RATIO
MONITOR - ANALOG
®
2650-1469-00
Installation
1. Disconnect the negative (-) battery cable.
2. Gauge can be mounted in a 2
1 ⁄
16
”. 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).
When power is applied to the gauge the pointer will move
counter clockwise to the stop pin, where it will remain
until voltage exceeds 12.5 v or voltage is applied to the
brown wire.
Once the gauge sees 12.5 volts, it will
begin heating the sensor and the pointer will move
back and forth between 8.0 and 9.0 on the dial. When
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. The Air/Fuel Ratio Monitor is intended for
use with
unleaded gasoline only.
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.
Mounting Sensor
Auto Meter recommends welding supplied
stainless steel bung with a TIG welder.
WARNING
Sender Will Get Very Hot During Operation.
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 900
o F.
the sensor is heated to the proper operating temperature the gauge will
begin reading air/fuel ratio in real-time.
Black Wire (Ground):
Connect to good engine ground.
White Wire (Lighting):
Connect to dash lighting dimmer control.
Brown Wire (Heater Override for applications that provide less than
12.5 volts with engine running):
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.
12V Ignition
Switch
Good
Engine Ground
12V Dash Lighting
or Auto Meter 9114
Dimmer Module
Fuse
Normally
Open Switch
(Optional)
Red
Brown
Blue
Black
Black
White
_
+
Data Logger
Gauge
Sensor