MSD 8969 Digital RPM Window Switch Installation - Manual

Digital RPM Activated Window Switch
PN 8969
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.
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