Miguel Almirón opened the scoring for the Magpies at Ibrox, with debutant Sandro Tonali having a hand in the build-up to the Paraguayan's cool finish, but Sam Lammers drew the hosts level in what was a testimonial match for long-serving Gers stopper Allan McGregor.
But full back Ashby's late intervention saw United come out on top at the home of the Scottish giants, with attentions now turning to the Premier League Summer Series in America as Howe and his charges get set to jet off on Wednesday.
Serena Taylor was in Glasgow to bring nufc.co.uk this gallery.