Near Tharabar Gate and along the road from Mingalazedi. If you show a horse-taxi the picture I am sure they will be able to find it for you.
Stunning views at sunrise!
***** Upstairs is not closed to tourists so I have mover cache to ground floor.
Enter the temple by the front door (facing Buddha) and when you are standing in front of the statue turn to your right, walk towards the side entrance - 2 steps and examine the wall close to the floor on your right.
Bring a pen.
Small note on cache maintenance: There is a local cache guardian. Name and contact info on file with geocaching.com.