MSD 8732 Installation
Digital 2-Step
PN 8732
For the Digital 6AL Ignition Control, PN 6425
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Parts Included:
1 – Control
4 – Mounting Screws
WARNING: During installation, disconnect the battery cables. When disconnecting the
battery, always remove the negative cable first and install it last.
Note: Must be used with an MSD Digital 6AL Ignition, PN 6425.
OPERATION
The Digital 2-Step Control is designed
specifically for the MSD Digital 6AL
TO
SWITCHED
12V
BLACK
TO GROUND
Ignition Control, PN 6425. It provides
the ability to set an rpm limit to be used
during the launch of the vehicle through
a switch or tied into a line-lock device
or trans-brake.
There is a Blue wire coming out of the
2-Step, that controls when the launch
rpm limit is activated. When this wire
is connected to 12 volts, the 2-Step is
activated. When released, the rpm limit
that is set in the Digital 6AL Ignition is
active. This wire can be tied into a trans-
RED
BLUE
ACTIVATE THE
2-STEP WITH
12 VOLTS
GRAY
TACH WIRE
ON MSD 6AL
TO
PN 6425
X1000 X100
ALWAYS SET THE RPM VALUE
WITH THE PRINTED NUMBER ON
THE HOUSING. THIS FIGURE
SHOWS A SETTING OF 3000 RPM.
brake circuit, a clutch switch or simply
a stand alone switch.
Figure 1
RPM LIMIT
The rpm limit is set with the two rotary dials, in 100 rpm increments. The limit can be programmed
from 2,000 rpm to 11,800 rpm. (The position for 11,900 is reserved for use with MSD's Power Grid
ignition system.)
LED
There is a useful LED built into the Digital 2-Step. This LED will illuminate when 12 volts are applied to
the Blue wire and the low rpm limit of the 2-Step is active. When 12 volts are removed from the Blue
wire the 2-Step rev limit and the LED will turn off.
3-STEP
If you prefer to have three different rev limits, a second PN 8732 could be used to provide a third rev
limit, such as for use during the burnout.
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2 INSTALLATION INSTRUCTIONS
MOUNTING
It is suggested to mount the unit within easy reach for adjustments. The Control can be mounted
under the hood but should be away from direct engine heat sources. Make sure the wiring reaches the
connections and mark the mounting holes. Use an 1/8” bit to drill mounting holes and mount the unit.
WIRING
WIRING
Red Power. Connect to a switched 12 volts.
Black Ground. Connect to ground.
Blue Launch RPM Activation wire. When connected to 12 volts the launch rpm value is active.
Gray Tach Signal. Connect to the Gray Tach Output wire of the MSD PN 6425.
12 VOLTS IGNITION KEY
DISTRIBUTOR
POINTS/AMPLIFIER
MAGNETIC PICKUP
MICRO SWITCH
PN 8820
OR
SWITCH OR
ORANGE
BLACK
WHITE
RED
VIOLET
TO 12V
GREEN
BLUE
GRAY
REV
LIMITER
GRAY
RED
12 VOLTS
DIGITAL 6AL
BLACK
X1000
TO GROUND
TACH
OUTPUT
X100
TO LINE LOCK
OR TRANS-BRAKE
SOLENOID
Figure 2 Wiring the Control with an MSD Digital 6AL Ignition Control.
M S D I G N I T I O N • WW W. MSD IG NI TIO N. CO M • (9 15 ) 8 57 -52 00 • FA X ( 91 5) 8 57 -3 34 4
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