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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!
P a r t s I n c l u d e d :
   1 - Soft Touch Rev Control   
4 - RPM Modules, 3,000, 6,000, 7,000, 8,000
4 - Wire Splicers
4 - Self Tapping Screws
4 - Wire Insulating Caps
WARNING: During installation, disconnect the battery cables. When disconnecting the battery, 
always remove the 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

The Soft Touch Rev Control comes from MSD 
programmed for 8-cylinder applications. It can 
easily  be  adjusted  for  operation  on  other  en-
gines 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 con-
nections. 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). 
M S D
I G N I T I O N
Soft Touch Rev Control
PN 8728
• w w w . m s d i g n i t i o n . c o m • ( 9 1 5 ) 8 5 7 - 5 2 0 0 • FA X ( 9 1 5 ) 8 5 7 - 3 3 4 4
4 - Mounting Pads and Sleeves
Figure 1 Selecting the Number of Cylinders.
Figure 2 Installing the Vibration Mounts.

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Summary of Contents for MSD 8728

  • Page 1 Soft Touch Rev Control PN 8728 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! P a r t s I n 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  ...
  • Page 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.  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 I G N I T I O N • w w w . m s d i g n i t i o n . c o m • ( 9 1 5 ) 8 5 7 - 5 2 0 0 • FA X ( 9 1 5 ) 8 5 7 - 3 3 4 4...
  • Page 3 INSTALLATION INSTRUCTIONS 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 I G N I T I O N •...
  • Page 4 INSTALLATION INSTRUCTIONS Figure 6 Wiring to a GM Dual Connector Coil System. Figure 7 Wiring to a Ford Duraspark Ignition. M S D I G N I T I O N • w w w . m s d i g n i t i o n . c o m • ( 9 1 5 ) 8 5 7 - 5 2 0 0 • FA X ( 9 1 5 ) 8 5 7 - 3 3 4 4...
  • Page 5 INSTALLATION INSTRUCTIONS Figure 8 Wiring to a Ford TFI Ignition. Figure 9 Wiring to a Chrysler Magnetic Pickup. M S D I G N I T I O N • w w w . m s d i g n i t i o n . c o m • ( 9 1 5 ) 8 5 7 - 5 2 0 0 • FA X ( 9 1 5 ) 8 5 7 - 3 3 4 4...
  • Page 6 INSTALLATION INSTRUCTIONS Figure 10 Wiring to a Late Model Dodge Ignition. RPM MODulE KITS RPM MODulE SElECTORS ODD EVEN INCREMENTS INCREMENTS PN 8743 PN 87431 PN 8670 3,000-3,800 3,100-3,900 3,000-5,200 4,000-4,800 PN 8744 4,100-4,900 PN 87441 4,600-6,800 PN 8671 PN 8745 PN 87451 PN 8672 5,000-5,800 5,100-5,900 6,000-8,200 PN 87461 PN 8673 6,000-6,800 PN 8746 6,100-6,900 7,600-9,800 PN 8747 PN 87471...
  • Page 7 INSTALLATION INSTRUCTIONS Tech Notes _______________________________________________________________________________________ _______________________________________________________________________________________ _______________________________________________________________________________________ _______________________________________________________________________________________ _______________________________________________________________________________________ _______________________________________________________________________________________ _______________________________________________________________________________________ _______________________________________________________________________________________ _______________________________________________________________________________________ _______________________________________________________________________________________ _______________________________________________________________________________________ _______________________________________________________________________________________ _______________________________________________________________________________________ _______________________________________________________________________________________ _______________________________________________________________________________________ _______________________________________________________________________________________ _______________________________________________________________________________________ _______________________________________________________________________________________ _______________________________________________________________________________________ _______________________________________________________________________________________ _______________________________________________________________________________________ _______________________________________________________________________________________ _______________________________________________________________________________________ _______________________________________________________________________________________ _______________________________________________________________________________________ _______________________________________________________________________________________ _______________________________________________________________________________________ _______________________________________________________________________________________ _______________________________________________________________________________________ _______________________________________________________________________________________ _______________________________________________________________________________________ _______________________________________________________________________________________ _______________________________________________________________________________________ _______________________________________________________________________________________ _______________________________________________________________________________________ _______________________________________________________________________________________ _______________________________________________________________________________________ M S D I G N I T I O N •...
  • Page 8 All returns must have a Return Material Authorization (RMA) number issued  to  them  before  being  returned.  To  obtain  an  RMA  number  please  contact  MSD  Customer  Service  at  1  (888)  MSD-7859  or  visit  our  website  at  www.msdignition.com/rma  to  automatically  obtain  a  number  and  shipping  information. ...

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