The Cap doesn't do much. it just smooth out the waves a bit when the RPM signal comes in. I tried different size of Cap, and the Tack is still there (before I fix it)
If you do a search, me and 2 others was struggling with the tack spike a month or two back.
We got a solution already by doing VR and Hall circuit.
Hope that helps.
Gil

~~~~~~~~Modification~~~~~~~~
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1995 RED Eclipse GS-'T': Stage VI 20PSI
2010 Audi S5 Quattro