Actron CP7911 User Manual
TACHOMETER
INSTALLATION
INSTRUCTIONS
GENERAL INFORMATION
Please read this instruction manual and
review the installation procedures carefully
before attempting the installation of your
tachometer.
NOTE
If additional wire is needed, use #18 or #20
AWG stranded automotive primary wire. For
exposed underhood wiring, teflon insulated
wire with its associated high temperature
capability is recommended. Additional
SAFETY GUIDELINES
To prevent accidents that could result in serious injury and/or damage to your
vehicle or test equipment, carefully follow these safety rules and test procedures.
SAFETY EQUIPMENT
Fire Extinguisher
Never work on your car without having a suitable
fire extinguisher handy. A 5-lb or larger CO2 or d ry
chemical unit specified for gasoline/chemical/
electrical fires is recommended.
Fireproof Container
Rags and flammable liquids should be stored only
in fireproof, closed metal containers. A gasolinesoaked rag should be allowed to dry thoroughly
outdoors before being discarded.
Safety Goggles
We recommend wearing safety goggles when
working on your car, to protect your eyes from
battery acid, gasoline, and dust and dirt flying off
moving engine parts.
NOTE: Never look directly into the carburetor
throat while the engine is cranking or running, as
sudden backfire can cause burns.
LOOSE CLOTHING AND LONG HAIR
(MOVING PARTS)
Be very careful not to get your hands, hair or
clothes near any moving parts such as fan blades,
belts and pulleys or throttle and transmission
linkages. Never wear neckties or loose clothing
when working on your car.
JEWELRY
Never wear wrist watches, rings or other jewelry
when working on your car. Youll avoid the
possibility of catching on moving parts or causing
an electrical short circuit which could shock or
burn you.
VENTILATION
The carbon monoxide in exhaust gas is highly
toxic. To avoid asphyxiation, always operate vehicle
in a well-ventilated area. If vehicle is in an enclosed
area, exhaust should be routed directly to the
outside via leakproof exhaust hose.
SETTING THE BRAKE
Make sure that your car is in Park or Neutral, and
that the parking brake is firmly set.
NOTE: Some vehicles have an automatic release
on the parking brake when the gear shift lever is
removed from the PARK position. This feature
must be disabled when it is necessary (for
testing) to have the parking brake engaged when
in the DRIVE position. Refer to your vehicle
service manual for more information.
HOT SURFACES
Avoid contact with hot surfaces such as exhaust
manifolds and pipes, mufflers (catalytic
converters), radiator and hoses. Never remove
the radiator cap while the engine is hot, as
escaping coolant under pressure may seriously
burn you.
SMOKING AND OPEN FLAMES
Never smoke while working on your car.
Gasoline vapor is highly flammable, and the gas
formed in a charging battery is explosive.
BATTERY
Do not lay tools or equipment on the battery.
Accidentally grounding the HOT battery
terminal can shock or burn you and damage
wiring, the battery or your tools and testers. Be
careful of contact with battery acid. It can burn
holes in your clothing and burn your skin or eyes.
When operating any test instrument from an
auxiliary battery, connect a jumper wire between
the negative terminal of the auxiliary battery and
ground on the vehicle under test. When working
in a garage or other enclosed area, auxiliary
battery should be located at least 18 inches
above the floor to minimize the possibility of
igniting gasoline vapors
HIGH VOLTAGE
High voltage 30,000 to 50,000 volts is
present in the ignition coil, distributor cap,
ignition wires and spark plugs. When handling
ignition wires while the engine is running, use
insulated pliers to avoid a shock. While not
lethal, a shock may cause you to jerk involuntarily
and hurt yourself.
JACK
The jack supplied with the vehicle should be
used only for changing wheels. Never crawl
under car or run engine while vehicle is on a jack.
1
connectors, and hardware, that are not
included with this unit may also be needed.
As the mounting configuration will vary
significantly from vehicle to vehicle, hardware
to mount the tachometer to the vehicle is not
included. Whether you use self tapping or a
machine screw and nut configuration, #8
hardware including flat and lockwashers is
recommended.
CAUTION
This unit is designed for use on twelve
(12) volt negative (-) ground four (4)
cycle automotive type engines. It is not
designed for use on positive (+) ground
electrical systems, two (2) cycle
engines, aircraft or marine applications.
It is compatible with most distributor
equipped and distributorless ignition
systems.
SUGGESTED TOOLS
Wire and terminal crimping, stripping and
cutting tool(s)
Screwdrivers and nut drivers as required by
hardware used
Small open end wrench set: 1/4" to 3/8" sizes
may be required
Electric drill
Drill bits:
#29 or 9/64", # 18 or 11/64", 5/16", 3/8"
PACKAGE CONTENTS
Tachometer
Tachometer Mounting Base Pad
Tachometer Housing to Column Bracket
Tachometer Dashboard Bracket
Installation hardware kit consisting of:
Wire Splices
Ring Terminals
1/4" Quick Connect Receptacle
Grommet
8-32 Nut, Black .................................. 1 ea
8-32 X 5/8" Machine Screw, Black .... 1 ea
# 8 Split Washer ................................1 ea
Knurled Thumb Nut ............................ 1 ea
Voltage 12V
Tension 12V
Tension de 12V
Made in China
Imprimé dans China
PRODUCTO HECHO EN China
FIGURE 1
LAMP
SOCKET
CYLINDER SELECTION
This tachometer should be checked for cylinder
setting before installation (see figure 1).
Position the CYLinder selector switch on the
rear of the tachometer so that the switch
actuator is opposite the number which matches
the number of cylinders in the engine.
For Chrysler DISTRIBUTORLESS IGNITION SYSTEM CONNECTIONS, connection
to Pin 43 of the Single Board Engine
Controller on Distributorless Ignition equipped
Chrysler vehicles requires that the CYLinder
selector switch be set to the four (4) cylinder
position, regardless of the number of
cylinders in the engine.
LAMP SUBSTITUTION OR
REPLACEMENT
Your tachometer is supplied with an automotive type, wedge base (full size tachometers)
or subminiature wedge base (mini tachom-
eters) lamp, for illumination. This lamp should
provide satisfactory illumination intensity in
most applications, however the following
substitute lamps are available at your local
auto parts store, and may allow you to
custom tailor the illumination characteristics
of the tachometer to your application. Note
the higher the MSCD (Mean Spherical
Candela) of the lamp, the brighter it is.
LAMP # MSCD COLOR BASE
73 .3 CLEAR
37 .5 CLEAR
74 .75 CLEAR
161 1 CLEAR WEDGE
194 2 CLEAR WEDGE
194A -
168 3 CLEAR WEDGE
AMBER COATED
The lamp socket is located at the top rear of
the tachometer (see figure 1). To remove the
lamp, gently grasp the black lamp socket (use
pliers if necessary) and twist it counterclockwise approximately 1/8 turn until it stops.
Pull the socket with lamp straight out of the
tachometer housing. Remove the lamp from
its socket by pulling it straight out. Replace
the lamp as required following the chart
above. Reinstall the socketed lamp by rotating
it against the tachometers PC board until it
drops into place, and then rotate it approximately 1/8 turn clockwise until it reaches its
mechanical stop.
WARNING - SAFETY PRECAUTION!
Neither the driver nor any passenger
should compromise the safe operation
of the vehicle by attempting to readjust
the tachometer in any way while the
vehicle is in motion!
SUBMINIATURE WEDGE
SUBMINIATURE WEDGE
SUBMINIATURE WEDGE
WEDGE
FIGURE 2
RED LINE/
SHIFT
POINTER
RED LINE / SHIFT POINTER
Adjust the RED LINE/SHIFT POINTER by
sliding it around the meter bezel (see figure
2). This pointer may be set at any point on the
meter scale, such as engine red line, or
transmission shift point.
NOTE
FUNCTIONAL QUICK CHECK
Although every attempt has been made to
make this tachometer electronically compatible
with as many different ignition systems as
possible, new ignition systems are being
developed continually. It is suggested
(especially if you have an engine that has a
non OEM, or aftermarket ignition system) that
the tachometer be electrically connected to
the vehicle, (using alligator clip leads or other
suitable means) following the steps below,
and an electrical functional check of the
tachometer be made, prior to making a
permanent installation.
1. Clip the BLACK lead from the tachometer
to the negative (-) battery terminal.
2. Clip the RED lead from the tachometer to
the positive (+) battery terminal.
3. Clip the GREEN lead from the tachometer
to the negative (-) side of the ignition coil
or tach signal connection point as indicated in the ELECTRICAL CONNEC-
TIONS section of this manual. Do not
allow this connection to touch ground!
4. The WHITE lead is for instrument panel lighting,
and need not be connected for this check.
5. When all connections are secure, start the
vehicles engine. Confirm the operation of
the tachometer throughout the operating
temperature range of the engine, and at
both curb idle, and higher engine speeds.
The tachometer should follow the speed of
the engine smoothly, and show no signs of
erratic operation.
Should you encounter unsatisfactory tachometer operation (erratic, no reading, etc.) on
engines equipped with high performance and/
or aftermarket ignition systems or ignition coils,
you may have selected the incorrect tach
connection point for the tachometers GREEN
lead, or a tachometer filter assembly may be
required.
Contact the manufacturer of the ignition
system or ignition coil for information
regarding tachometer connection to his
product and/or the availability of an
electrical filter assembly if required.
When you are satisfied with tachometer
performance, proceed to the permanent
installation instructions which follow.
2
MOUNTING THE
TACHOMETER
Your tachometer is designed to be mounted
on top of or underneath the dashboard, or on
the steering column (see figures 3 and 4). If
you choose the steering column mounting
configuration, it will be necessary to obtain a
hose clamp which is large enough in
diameter to encircle the steering column. Cut
off any excess strap from the hose clamp,
when clamp mounting is complete.
CAUTION
Some steering columns are made to be
collapsible upon impact. Care should be
taken when tightening the clamp to
avoid damage to the column.
Be sure not to interfere with the movement
or mechanism of adjustable/tilt steering
columns.
Select a mounting location that allows a clear
view of the tachometer, but does not
obstruct access or view of controls, or view
of other dashboard instruments, or the road.
CAUTION
Position the tachometer in its specific
location and determine wire routing and
connection locations before drilling any
holes! Be sure to check behind areas of
intended drilling for obstructions before
drilling!
Mark hole locations, and drill holes as
required per the following chart.
# 8 Self-tapping screws #29 or 9/64" drill bit
# 8 Machine screw hardware #18 or 11/64" drill bit
Clearance hole for wiring harness
Once the tachometer is adjusted to its final
position, securely tighten all hardware.
FIGURE 3
FIGURE 4
HOSE CLAMP
RUBBER
PAD
5/16" drill bit
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