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Hey Jess -
Someone else may have a better idea than me around how to handle this in v7, but your challenge is that any use of dual axes to attempt to get your symbols into the chart itself cause them to be repeated once per period - which would probably look silly.
Perhaps you can work around that with some sort of table calc, but you may find it to be more trouble than it's worth.
In the upcoming Tableau v8, we allow you to "float" other items (images, other vizzes, whatever) inside and over your sheets. In the screenshot below, I've simply positioned 3 images inside the "gap" between the "sales" header and the numerical axes labels:
It's not exactly what you want, but it calls for much less precise positioning that you're having to deal with right now in terms of "lining up" the two sheets so they appear to be one.
Hope this helps!