ATI damper

i saw that. reason iam asking is that friend of mine has one on a 12v and no timming marks.
 
i bought the 12v version so that it would have the notches to run an autometer tach...not realizing that there are only 2, and i need 4.

does anyone know if you can machine 2 extra notches in an ATI damper the same as what are already there to use an autometer pickup sensor?
 
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