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Sales in dollars and units sold sit on such different scales that combining them into one chart flattens the smaller measure to almost nothing.
What you'll have at the end
A combo chart with sales as bars and units sold as a line, each on its own honest, zero-anchored axis instead of one shared scale, plus a clear rule for the rare case where lining those two axes up is actually the right call.
You need
A worksheet with sales and units sold already placed on Rows as two separate measures, before they've been combined into one dual view.
Not covered
Picking which two measures belong together in the first place, or building the calculated fields behind either one: this starts once sales and units sold are already the two measures you want compared.
Checked 26 Aug 2026
Part of the Tableau cookbook