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Old 10-01-2012, 11:56 AM
Greatneck40 Greatneck40 is offline
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Default Grey wire on msd 6al

Hello. I have a 83 porsche sc
All the diagrams are great though there is no mention of where the grey wire off the msd harness goes.
I suspect it is the tach output wire.
Is that right?
If so would it connect to the car's harness at TD?

Thanks
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Old 10-01-2012, 02:49 PM
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msdtech1955 msdtech1955 is offline
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from page 2:

TACHOMETERS
The MSD Ignition features a Gray Tach Output wire that provides a trigger signal for tachometers, a
shift light or other add-on rpm activated devices. The Tach Output wire produces a 12 volt square
wave signal with a 22.5 duty cycle.
Some vehicles with factory tachometers may require a Tach Adapter to operate with the MSD. For
more information on Tachometers and MSD Tach Adapters, see the Tachometer Section on page 6.
If your GM vehicle has an in-line filter it may cause the tach to drop to zero on acceleration. If this
occurs, bypass the filter.

PAGE 4:

GRAY:
Tach output wire. Connects to the tachometer trigger wire or other
rpm activated device.
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