MSD 8956 Window RPM Activated Switch Installation - Manual (Page 2)

2 INSTALLATION INSTRUCTIONS
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• 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 • F A X ( 9 1 5 ) 8 5 7 - 3 3 4 4
CYLINDER PROGRAMMING
The Window Switch is programmed for 8-cylinder applications, however it can be used with 4 or
6-cylinder applications. To program the Switch for different applications, the cylinder select loops
must be modified as shown in Figure 2. After cutting a wire loop, seal the wire end with the supplied
head-shrink caps. Use a heat gun or other heat source to shrink the cap for a good seal.
Figure 3 Wiring to an Inductive Ignition System.
MOUNTING
The Switch may be mounted under the hood as long as it is away from direct engine heat sources.
Keep in mind that the rpm modules should be easy to access for changes. The Switch can be mounted
with the double-sided tape or with the four self tapping screws supplied. Use the Switch as a template
and mark the mounting hole locations. Remove the Switch and drill the holes using a 3/16" drill bit
then install the screws.
WIRING
Red Connects to a switched 12 volt source.
Black Connects to ground.
White The rpm input wire. With an MSD Ignition, this connects to the Tach Output terminal.
On inductive ignitions, it connects to the coil negative terminal.
Yellow This is the circuit ground wire (normally open switch to ground). It connects to the
ground side of the device you plan to activate.
Note: Inductive ignitions only.
Figure 2 Cylinder Select Loops.
CYLINDERS CUT LOOPS
8 NONE
6 RED
4 RED & BLUE