MSD 8969 Installation

Digital RPM Activated Window Switch

PN 8969

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Parts Included:

1 - Digital Window Switch, PN 8969
1 - Parts Bag

OPERATION

The MSD Digital RPM Activated Window Switch accepts a variety of input signals from sources
such as a coil negative terminal (factory inductive ignitions), a CD ignition tach-output such as
an MSD 6 or 7 Series Ignition, an output from an ECU, or a 5-400 volt signal from an MSD Tach
Adapter.

The PN 8969 can be programmed for use on nearly every engine with a spark ignition or tachometer
signal. The rpm values are adjustable in 100 rpm increments from 200 - 15,000 rpm (The rpm is shown
x100). There must be a difference of at least 300 rpm between the two activation points for correct
operation. Changes can be made while the engine is running.

Note: There is a 200 rpm safety range built into the activation and deactivation points. This means
that the rpm must drop 200 rpm below the activation point to turn the circuit off. Conversely, the rpm
must drop 200 rpm below the deactivation point in order to turn the circuit back on. This is to prevent
the circuit from ‘chattering on and off’.

This switch is also capable of activating a circuit at a higher rpm than the Off rpm.

PROGRAMMING THE RPM

The engine application and rpm activation points are easily selected through push buttons on the
LED panel (Figure 1). This Switch can be programmed for a variety of engine and ignitions as shown
in the following chart.

1-Cylinder This program is used for individual coil per cylinder systems (such as GM
LS-1 engines, or ’99-Up Mustangs).

2-Cylinder This is for ignitions with coil packs that fire two cylinders at the same time
(waste spark systems).

2-Cyl. Odd Use on coil pack ignitions that are on odd-fire engines such as a
Viper V-10 or Harley-Davidson motorcycle.

4-Cylinder Typical 4-cylinder engines with a distributor.

6-Cylinder Typical 6-cylinder engines with a distributor.

6-Cyl. Odd Typical 6-cylinder odd-fire engines with a distributor.

8-Cylinder Typical 8-cylinder engines with a distributor.

M S D   •   W W W . M S D P E R F O R M A N C E . 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

2 INS T ALL ATI O N I N STR UCT I ONS

The rpm activation points and cylin­der select are programmed through
the push buttons on the LED panel
(Figure 1). Press the Mode button,
and notice that the indicator light
above the On RPM lights. When that
point is on, you can scroll the rpm
value up or down with the arrows on
the left of the panel. Once your On
rpm is set, push the Mode button
until the Off RPM point lights, then

Figure 1 Programming the Digital Switch.

set the Off rpm point. Note that if the
rpm point is not changed within 2-seconds, the screen returns to the current rpm reading (zero when
the engine is not running). After setting the On and Off points, press the Mode button to program the
Cylinder Select Valve (default is for 8-cyl.).

WIRING

RED

BLACK

WHITE

This is the On/Off wire. Connects to switched 12 volts.

Connects to a good ground source.

Signal Input. Provides the trigger signal from a tach input, +5-12 volt signal from
an ignition tach output terminal, ECU output or coil negative terminal.

OUTPUT WIRES

GRAY

Normally Closed. This wire will remove the ground source at your desired
On rpm, and complete the ground circuit at the set Off rpm.

YELLOW

Normally Opened. This wire will provide a ground source at your desired On
rpm, and remove the ground at the set Off rpm.

Note: The output wires are capable of a switch load of 2.5 amps, continuous. The operating
input voltage of the Switch is 9-18 volts.

Figure 2 Wired to a Stock Inductive Style Ignition at the Coil Negative Terminal.

M S D   •   W W W . M S D P E R F O R M A N C E . 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