The Official Online RBS 6 Nations Store is open. The store has everything you need to get behind your team during the RBS 6 Nations, plus the store is now fully stocked with a much wider range of rugby merchandise.
Tuohy started alongside other new names in lock Bernie Upton and No8 Mike McComish, with young developments players Tiarnan O'Halloran and Eoin Griffin introduced as second-half substitutes.
Another debutant, out-half Miah Nikora, kicked the visitors into an early lead and the former New Zealand Under-21 international landed three penalties in all in a scrappy encounter.
All three kicks were in the first half as Harlequins turned around with a 10-9 lead, thanks to a George Lowe try and a penalty and conversion from Rory Clegg.
Clegg touched down for Quins shortly after the restart and while Tuohy’s try, from a well-executed back-line move, set up an exciting final quarter but the home side held on.