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That was years ago i did it that way.
Bout few months ago i was checking/setting tining on my sr after cam swap and i used a cheap-o timing light. Couldnt get it to work off the white "hoop" wire or the entire harness going to cyl1 coil. Had to use a spark plug wire to get it to work properly.
At this point id just say all 3 ways work but would depend on the quality of the timing light used.
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