Need help, no spark!

it is a very simple system from the diagram. Is it possible that it was damaged by running it with any combination of wires other than the way the diagram showed. IE if the first one worked then you hooked up the tach and now it is dead. and the second one is dead ( presumably with the tach wire still hooked up) maybe the tach wire is killing the unit? (pure speculation)

In your first post you said you had power at the yellow wire when in start, the diagram does not show the need for that.