You must tell the Taxi/Tuk Tuk that you want to go to “Wat India” (‘Wat’ means ‘temple’ in Thai). Either say ‘Wat Sikh’ or ‘Wat India’. There’s a South Indian Hindu Mandir (‘Wat India’) 100m away from Gurdwara.
The Provincial Prison (‘ruan-cham’ in Thai) is located right at the T junction.