How to let my dashboard queries send out email alert?

I am able to schedule a search to send me email alert when certain conditions met (for example when the search gets `error count` greater than 0) 

And I have a dashboard for the same query. I really would like to use my dashboard query to do the scheduled run and send me email if condition meets. I have to maintain 2 sets of exact same queries, and it is troublesome when I need to make changes to these queries, as the same change always has to be made in both places.