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However, it is designed to work with a twin and I my bike has 4 cylinders. Anyone know if theres a way to make it work accurately on 4 cylinder? I've heard it will work if you hook it up to #1 coil?
From my (limited) understanding it reads the pulse as each coil discharges. I don't think it would matter how many cylinders the bike has as long as you only hook it to one coil. It also shouldn't matter if the coil is a double output as both cylinders will be firing in time.
The whole cylinder amount for tachs comes from cars that use a distributor and only one coil. Since the coil will fire once for each cylinder the tach needs to match the cylinder amount to read correctly.
Actually, it does matter. Some bikes use a wasted spark system, so you're getting twice as many sparks as you would actually need. Almost all four cylinder bikes fall into this category.
Though as a corollary, it doesn't matter from to plug wire you attach the pickup. Cylinder one will get you the same results as two, three, or four. The tach will either work or it won't.
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