Gary the Gadget Guy is now appearing on Club Penguin. He only shows up in the Secret Lab which is for members. My buddy posted a guide on How to Find Gary the Gadget Guy in Club Penguin but it’s pretty simple. If you’re a member, hang out in the secret lab and wait for him. 😛
Gary only goes to that room.
To get to the secret lab, go to the second floor of the coffee shop and then click on the candle in the bookshelf. It will open a secret staircase and if you have the rad scientist outfit you can go in.