Msd 8950 RPM Activated Switch Installation- User Manual
Msd 8950 RPM Activated Switch Installation– User Manual, read for free online in PDF format. We hope this helps you resolve any issues you may have. If you have further questions, please contact us through the contact form.
Table of Contents:
- Page 2 – CYLINDER PROGRAMMING; Use a heat gun or other heat source to shrink the cap for a good seal.; Figure 2 Cylinder Select Loops.; BLUE; CAP; CYLINDERS CUT LOOPS; NONE; WIRING; Red; Connects to a switched 12 volt source.; MOUNTING; then install the screws.
- Page 3 – Figure 4 Wiring to an MSD Ignition Control.
- Page 4 – Module Selectors: These Selectors; offer 12 different rpm limits at the; or consequential damages.; Service; When returning MSD components for warranty service,; Proof of Purchase must be supplied for verification. After; All returns must have a Return Material Authorization (RMA) number; issued to them before; M S D
IMPORTANT: Read the instructions before attempting the installation.
Parts Included:
1 - RPM Switch
4 - Heat-Shrink Caps
4 - Self Tapping Screws
Note: RPM Modules must be purchased separately. See the chart on the last page for part numbers.
The RPM Activated Switch can be connected to stock ignition systems or MSD Ignitions. When using a
capacitive discharge ignition such as an MSD,
do not connect the Switch to the coil negative terminal.
Damage to the Switch may occur.
The Switch is capable of carrying 1.5 amps. If the circuit you are activating requires more current,
an MSD Relay, PN 8960 or 8961 must be used. The MSD RPM Activated Switch is equipped with a
"smart driver". This circuit will protect the RPM Switch from damage by monitoring its temperature.
If there is an inadvertant short or too much current is drawn through the Switch, the smart driver will
sense the increased temperature and shut the Switch off. However, once the temperature drops to a
safe point, the smart driver will turn the Switch back on. It will continuously cycle On and Off as the
temperature dictates.
If you experience a problem with your Switch not operating, turn the circuit off for a few minutes to cool,
then try again. If the circuit activates then shuts off, there may be too much current flow. Check the
device's Installation Instructions to find its recommended maximum current.
The RPM Switch has two activation wires. The Yellow wire is Normally Open and will activate a circuit
by switching to ground. The Gray wire is Normally Closed to ground and will open the ground circuit
at the desired RPM (Figure 1). If no rpm module is installed, the Switch will not activate the circuit.
Figure 1 Operation of the RPM Activated Switch.
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 • F A X ( 9 1 5 ) 8 5 7 - 3 3 4 4
ONLINE PRODUCT REGISTRATION: Register your MSD product online and you’ll be entered in our
monthly 8.5mm Super Conductor Spark Plug Wire give-away! Registering your product will help if there
is ever a warranty issue with your product and helps the MSD R&D team create new products that you
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MSD RPM Activated Switch
PN 8950
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Summary
2 INSTALLATION INSTRUCTIONS 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 • F A X ( 9 1 5 ) 8 5 7 - 3 3 4 4 CYLINDER PROGRAMMING The Switch is programmed for 8-cylinder applications, however it can be used with 4 or 6-cylinder applications. To prog...
INSTALLATION INSTRUCTIONS 3 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 • F A X ( 9 1 5 ) 8 5 7 - 3 3 4 4 Figure 4 Wiring to an MSD Ignition Control. Figure 5 Wiring with an MSD Relay. Note: Capacitive discharge ignitions only. Figure 6 Wiring wi...
RPM PART NUMBER 3,000 - 5,200 PN 8670 4,600 - 6,800 PN 8671 6,000 - 8,200 PN 8672 7,600 - 9,800 PN 8673 9,000 - 11,200 PN 8674 RPM Module Kits are supplied with five modules in a range of 200 rpm increments. There are even number sets and odd number sets available. Example: PN 8746 includes 5,000, 5...
