MSD 8725 Installation

Electronic Governor

PN 8725

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Parts Included:

1 - Electronic Governor
3 - RPM Limit Modules
(3,600, 3,800 and 4,000 RPM)

WARNING: Do not attempt to use this unit with Capacitive Discharge Ignition systems - for use

with standard systems only.

MOUNTING THE ELECTRONIC GOVERNOR

The Electronic Governor may be mounted in any location in the engine compartment except on the
engine or near the exhaust manifold. Excessive heat at these locations could damage the unit. When
selecting a mounting location, make sure that the cable assembly will reach to the locations shown
in Figure 1, 2, 3, or 4. Mark locations of the mounting holes at the corners of the unit and drill 1/8"
holes at these locations. Mount the unit using the self tapping screws provided in the parts kit.

2 - Wire Splice Devices
4 - Self Tapping Screws

PROGRAMMING FOR 4, 6 OR 8 CYLINDER OPERATIONS

The short Red and Blue wire loops coming out of the Engine Governor are used for programming
the unit for 4, 6, or 8 cylinder operation. Modify the loops as described for the number of cylinders
that your engine has. Remember to tape any cut wires to prevent shorting.

8-Cylinder: Do not cut any loops.
6-Cylinder: Cut only the Red loop.
4-Cylinder: Cut both the Red and Blue loops.

SETTING THE RPM LIMIT

The RPM that the limiting action occurs at is easily adjusted with plug-in modules. Modules for 3,600,
3,800 and 4,000 RPM are included with this unit. Choose one and plug it into the module receptacle.
If other RPM Modules are desired, see the list of RPM Module Kits on page 4.*

CONNECTING THE ELECTRONIC GOVERNOR

Figures 1, 2, 3 and 4 show the hookup for most vehicles. Select the proper diagram to connect the
Engine Governor to your particular make of vehicle.

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 57 - 3 3 4 4

2 INSTALLATION INSTRUCTIONS

RPM MODULE

ELECTRONIC GOVERNOR

PN 8725

MAKE SURE THAT THE RED WIRE IS CONNECTED TO
THE IGNITION KEY SIDE OF THE BALLAST RESISTOR.

Figure 1 Hookup for Domestic and Foreign Vehicles using a Threaded Stud Coil.

BLACK

IGNITION

KEY

RED

GREEN

ENGINE

GROUND

FROM BATTERY (+)

COIL

FROM POINTS OR

AMPLIFIER

BALLAST

IF USED

(+)

(-)

ELECTRONIC GOVERNOR

PN 8725

RPM MODULE

GREEN

BLACK

BROWN

RED

ENGINE

GROUND

PINK

BLACK

Figure 2 Hookup for GM Vehicles with the Unitized HEI system.

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 57 - 3 3 4 4