The NEW Garmin 1040 and has an elongated back lower edge.  This edge makes this Garmin longer than any other Garmin cycling computer to date.  The ENVE Road Stem Combo mount has interference when run in it’s alternative position with the Garmin 1040. Please see below instructions for mounting your ENVE Road Stem Combo Mount to accommodate your Garmin 1040.

The configuration below will work with a 1040...

However, the configuration below will have interference between the tail of the 1040 and the mounting screws...