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Can anyone explain how to hook up a dwell/tach to the primary coil? Tach has positive and negative leads and I know is supposed to connect to the tach lead (grey or purple) at the primary coil on the low voltage side. So I disconect the tach and put a red lead on coil then ground the black clip?

(Hooking up the tach to get the idle mixture correct and ensure the timing is right)


Thanks.