Grey wire on msd 6al

[Greatneck40]

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

[msdtech1955]

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.