Recently went to Hong Kong and of course had to visit The Peak on Hong Kong Island.
First of all, the tram is not wheelchair accessible. So, you will either need to take the bus or a cab. I recommend Diamond Cab as they have a few vehicles that can fit a user in their wheelchair.
The lower part of The Peak is a shopping mall, but the main feature is the rooftop viewing area called Sky Terrace 428. When you buy your ticket you will need to wait for staff to come and guide you. This is because the route goes through staff areas and uses a special elevator. Since the elevator is a hydraulic one, it is a bit cramped and has a weight limit. Power wheelchairs should be fine, but your companion will need to take the stairs.
Once on the roof, there are ramps to get to different levels and everything is fully accessible. However, note that it is extremely crowded (especially at night), so to get a good view you must wait or be agressive about getting forward.
When you are ready to return, just find a staff member and they will help you.
yes… It seems that only those wheelchairs under the limit of 24 inches and manually controlled can board the cabin of the tram with the assistance of staff. https://e-cgo.org.hk/travel/en/trip-detail?id=4