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Those tachs look much better than what I got via Ebay a few years ago as well as about half the cost, and the mounting clamps are far more substantial. As sfair says you likely will need a single fire adapter, but you can make one yourself inexpensively (try the Gadgets pages) or get one ready made for something like $10.
 

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Discussion Starter #5
Single fire

What is the difference between single and double (dual?) fire? Surely V-twins fire on both cylinders? (sorry for my ignorance)
 

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Single fire - spark plug fires once per 720 degrees of crankshaft rotation.
Dual fire - spark plug fires twice per 720 degrees of crankshaft rotation.
 

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or to paraphrase sfair:
Dual fire uses a single coil that fires both cylinders at the top of every stroke; compression and exhaust.
Single fire uses two coils and only fires on the compression stroke; one coil for each cylinder.
 

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Discussion Starter #9
Single fire

Thanks I get it (I think), and the VN900 has 2 coils = single fire. Is the fact that it is a mechanical tach a problem?
 

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or to paraphrase sfair:
Dual fire uses a single coil that fires both cylinders at the top of every stroke; compression and exhaust.
Single fire uses two coils and only fires on the compression stroke; one coil for each cylinder.
Incorrect. Number of coils have nothing to do with single vs. dual fire.
Also, dual fire does NOT fire both cylinders together.
 
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