Msd 8918 Tach Signal GMR Pickup Installation- User Manual
Msd 8918 Tach Signal GMR Pickup 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 – Note: The device that; the green signal; Note: The device that the green signal output wire is attached
- Page 3 – Figure 3 Installation on a Distributorless Coil Pack.; Figure 4 Installation to a Diesel Injector.; Note: The device that the green; signal output wire is attached; Note: The device that the; green signal output wire
- Page 4 – T M; Figure 6 Wiring the 12 Amp Pro Mag with GMR and PN 8963 Shift Light.; Service; returning MSD components for warranty service,; issued to them before; M S D
MSD GMR Pickup
PN 8918/PN 89181
Parts Included:
1 - Giant Magnetoresistive Pickup, PN 8918/PN 89181
2 - Washers
1 - Brass Screw
1
1 - Parts Bag
The MSD GMR pickup can be used with inductive or capacitive ignition types to provide an rpm sig-
nal of 30% duration when the ignition coil fires. Two washers are provided with the pickup and must
be installed in one of two positions depending on the type of ignition driving the coil.
Note: For late model applications, it is recommended to have a wiring schematic of the vehicle’s
ignition system.
CAPACITIVE DISCHARGE IGNITIONS
For a CD Ignition such as an MSD, the two washers should be installed under the metal tab to pro-
vide a small air gap between the metal tab and the pickup sensor (Figure 1). Refer to note on Figure
2 for RPM Device programming.
INDUCTIVE COIL PER CYLINDER IGNITION
For an inductive ignition (mostly stock applications) the metal tabs must make contact, therefore no wash-
er is required. There should be no air gap between the metal tab and the pickup sensor (Figure 2). Refer
to note on Figure 3 for RPM Device programming.
DISTRIBUTORLESS COIL PACKS
On distributorless applications, the GMR pickup must be installed on the primary lead going to one
of the coils. If the pickup is installed on the main ignition +12v wire feeding more than one coil, the
pickup may not operate correctly at high speeds because of overlapping coil dwell current failing to
fall to zero current between coil operating cycles (Figure 3). Refer to note on Figure 3 for RPM Device
programming.
DIESEL INJECTOR
The GMR Pickup can easily be clipped to power fed wire of a Diesel Injector to provide a tach signal.
On a diesel, the washer must be installed under the screw head on top of the metal tab so there is
no air gap between the metal tab and the pickup sensor (Figure 4).
Note: If the GMR Pickup is attached directly to the individual injector the RPM device that is being
used must be programmed for single cylinder application. If the GMR Pickup is attached to
the main 12 volt feed to the injector harness, the RPM device must be programmed for 4, 6 or
8 cylinder depending on application.
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
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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 BLACK GROUND MAGNETIC CONNECTOR NOT USED TO BATTERY WHITE BLACK ORANGE WHITE BLACK ORANGE RED TO BATTERY BLACK TRIGGER INPUT GMR PICKUP RED ...
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 BLACK GROUND RED RED GREEN SWITCHED 12 VOLT SIGNAL OUTPUT GREEN GMR PICKUP NOTE: The brass screw must be used for proper operation. PRIMARY ...
TO GROUND ON CYLINDER HEAD BLACK RED IGNITION T M CHASSIS GROUND GMR PICKUP NOTE: The brass screw must be used for proper operation. PRIMARY COIL (+) WIRE OR DIESEL INJECTOR 12 VOLT WIRE WASHER MUST BE ON TOP OF METAL TAB METAL TAB BLACK GROUND GMR PICKUP RED GREEN SWITCHED 12 VOLT SIGNAL OUTPUT TO ...
