MSD 8728 Installation
Soft Touch Rev Control
PN 8728
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Note: This Soft Touch Rev Control, PN 8728, is designed for inductive style ignition systems only. It
cannot be used with an MSD Ignition Control!
Parts In c l u d e d :
1 - Soft Touch Rev Control
4 - Mounting Pads and Sleeves
4 - RPM Modules, 3,000, 6,000, 7,000, 8,000
WARNING: During installation, disconnect the battery cables. When disconnecting the battery,
always remove he Negative cable first and install it last.
Note: The RPM limit is set with plug-in rpm modules. If an rpm module is not installed, there will be
no rpm limit.
CYLINDER SELECT
4 - Wire Splicers
4 - Self Tapping Screws
4 - Wire Insulating Caps
The Soft Touch Rev Control comes from MSD
programmed for 8-cylinder applications. It can
easily be adjusted for operation on other engines by cutting the cylinder select wire loops
(Figure 1). If the loops are cut, use the supplied
insulating caps to seal the wire ends.
MOUNTING
The Rev Control can be mounted in the engine
compartment but away from direct heat sources. It is recommended to mount it where the rpm module is easy to access
for rpm adjustments. Make sure all of the wiring reaches their
connections. Once a suitable mounting location is determined
mark the location of the mounting holes by using the unit as a
template. Remove the unit and use an 1/8” bit to drill the holes.
Install the supplied mounts and use the four self tapping screws
to secure the Control (Figure 2).
Figure 1 Selecting the Number of Cylinders.
Figure 2 Installing the Vibration Mounts.
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2 INSTALLATION INSTRUCTIONS
WIRING
WARNING: High voltage is present on the coil terminals. Do Not touch the coil terminals or
tower when the engine is cranking or running.
Red Connects to a switched 12 volt source.
Black Connects to ground on the engine.
Green Connects to the coil negative (-) terminal.
Trigger Pickup Wires
White If the distributor is triggered by breaker points or an amplifier, this wire needs to be
spliced to its trigger wire.
Violet If the distributor uses a magnetic pickup, this wire needs to be spliced into the positive
mag pickup wire.
Figure 3 Wiring to a Points/Amplifier Ignition.
M S D • W W W . M S D P E RF O R M A N C E . C O M • ( 9 1 5 ) 8 5 7 - 5 2 0 0 • F A X ( 9 1 5 ) 8 5 7 -3 3 4 4
INSTALLATION INSTRUCTIONS 3
Note: The GM Unitized Coil, HEI Distributor was produced
with several different modules. If this installation
seems to cause a rough limit, try the wiring shown
in Figure 5 below.
Figure 4 Wiring to a GM HEI Distributor, using the Module.
Figure 5 Wiring to a GM HEI Distributor using the Magnetic Pickup.
M S D • W W W . M S D P E RF O R M A N C E . C O M • ( 9 1 5 ) 8 5 7 - 5 2 0 0 • F A X ( 9 1 5 ) 8 5 7 -3 3 4 4
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