I found the Gorilla Glue tape in Black. I carry it in the same way - wrapped around an old card of the plastic variety. It's some seriously sticky stuff. It's easily the stickiest I've found. I have used it to tape parts back on my truck and it keeps them there. I used it the other day to tape a coworker's belt prep holder back together. He was a little taken aback that I carry duct tape in my pocket. Heh. If he only knew what all I carry.

I have no recommendation for electrical tape.