Mallory Ignition 29078 User Manual
INSTALLATION INSTRUCTIONS
PART NO. 29078
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NOTE: Mount the Mallory Fuel Injection/Tach Adapter away from hot
engine components and moving parts, such as fan belts and
linkages. Mount the unit under the hood or in the passenger
compartment using the two sheet metal screws provided.
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Wiring diagrams for this unit are shown on the back of this instructions sheet.
RED
12 volt power
BLACK
Ground
GREEN
Trigger from ignition
ORANGE
To tach trigger lead and/or
fuel injection trigger
Connect to the ignition supply lead. This is normally the wire from the ignition switch.
Connect to a clean ground on the vehicle frame or sheet metal.
Connect to the “TACH” terminal of the ignition system.
Connect to the tach or fuel injection trigger
if the tach is a voltage triggered model that
requires a high voltage signal.
Do not use this wire if the tach is a “series” type,
such as those used on older Ford and AMC
vehicles. In this configuration, the ignition power wire serves as the tach trigger wire. Current
pulses from the Mallory Tach Adapter will trigger the tach.
NOTE: In writing these instructions, we assume that
you have installed a Mallory ignition box or similar.
Connect the Mallory Adapter Part No. 29078 as
shown below.
Older voltage triggered tachometers
This type of tachometer cannot be triggered from the low
voltage tach output of modern capacitive discharge ignition
systems. Mallory's tach adapter eliminates this problem. See
Figure B.
BLACK –
GROUND
ORANGE – NOT USED
PART NO. 29078
TO IGNITION SWITCH
TACH
RED
IGNITION POWER WIRE
(PREVIOUSLY CONNECTED
TO COIL + TERMINAL)
GREEN – TO TACH TERMINAL OUTPUT
CAPACITIVE DISCHARGE
IGNITION BOX OR SIMILAR
TACH TERMINAL
ORANGE –
TO TACH TRIGGER LEAD
AND/OR FUEL INJECTION TRIGGER
TO IGNITION SWITCH
BLACK –
GROUND
PART NO. 29078
RED
GREEN – TO TACH TERMINAL OUTPUT
CAPACITIVE DISCHARGE
IGNITION BOX OR SIMILAR
TACH TERMINAL
www.malloryracing.com
Made in U.S.A. Printed in U.S.A.FORM 1410 (Rev. C) 02/06
Figure A
Fuel injection systems
Some fuel injection systems may require a high voltage
triggering signal that is not available from modern capacitive
discharge ignition systems. Mallory's adapter provides the
triggering signal. See Figure B.
Figure B
CURRENT TRIGGERED (SERIES) TACHOMETERS
You can use this adapter with an ignition system that provides a
voltage triggered tach output, such as most capacitive discharge
ignition systems. See Figure A.
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