Adding Expenses to Dashboard?

I'd like to be able to add expenses to a widget on my dashboard, then from that, calculate net, based on income minus expenses - this is primarily aimed at direct mail income minus expenses = net..

I have added some costs on the 'Expenses' tab under Campaigns but I can't see how I then pull that into Analytics?

I do have both my contributions and finance data cubes attached to the dashboard. Any suggestion / has anyone a widget / dashboard to share?

Thank you!