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Just a shot in the dark here ( I'm a newb as well) starter relay , fuses , stator pickup line not charging the battery well enough. The click you hear is because the starter isn't getting enough power. Check the gauge of wire being used on the starter might not be adequate. Also be sure to run a battery tender to make sure the battery has a good charge.
Tach usually get the rpms from the sparkplug one way or another but it might just be bad cluster you could get a cheap tach for addressing certain issues buts if you can live without it then its not needed.
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