You can't really convert units of money to any other units, so I'm not convinced of the utility of money conversion in this kind of tool.
US Dollars would be connected to US Cents in the graph, and Pounds Sterling and New Pence would be connected to each other too, but those two subgraphs would be entirely disconnected from each other and from any SI unit like distance or mass.
It's useful for some practical conversions like fuel efficiency calculations. I think in USD per mile and it's handy to be able to directly take CAD/liter and l/km for my trips to Canada.
US Dollars would be connected to US Cents in the graph, and Pounds Sterling and New Pence would be connected to each other too, but those two subgraphs would be entirely disconnected from each other and from any SI unit like distance or mass.