MSD 8969 Digital RPM Window Switch Installation - Manual (Page 2)

2 INSTALLATION INSTRUCTIONS
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The rpm activation points and cylin-
der 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
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.).
Figure 2 Wired to a Stock Inductive Style Ignition at the Coil Negative Terminal.
WIRING
RED This is the On/Off wire. Connects to switched 12 volts.
BLACK Connects to a good ground source.
WHITE 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.
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.
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.
OUTPUT WIRES
YELLOW
Normally Opened. This wire will provide a ground source at your desired On
rpm, and remove the ground at the set Off rpm.
Figure 1 Programming the Digital Switch.