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It is more than 12 so, based on options presented must be 20.Saw the post on the other repair forum.
You ever figure out the poles on the stator?
From the other post.
These older Chryslers used an 8 pole and some a 12 then even a 20
Most 55's had a 8
Pull the flywheel or try to count the lugs on your stator.
Then see if you can find a tach that works with the amount
of lugs on the stator.
Then Google 8 pole or 12 pole tachs.
Good luck, Faria, one of the places that makes aftermarket tachs
says they no longer make a 20p