You can hook it up to either coil, the only issue is whether yours is a single-fire or dual-fire bike, that is, do both coils fire on every revolution, or only one? Firing only one per revolution is usually only on fuel-injected bikes, because the control system already knows which cycle the cylinder is on. Or, on bikes with points driven by the camshaft, like my old CB450.
If it fires on every revolution, the tach reading, when set to 8, will be multiplied by 4; otherwise, by 8.
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'68-7? CB450 and '98 Valkyrie Tourer, too