Kurt Paul was in an episode of Knight Rider,
"Halloween Knight." It was three years before he was on Sledge Hammer, but he played a character named "Norman Baines." And they used the Psycho theme and the Universal Psycho house in the episode as well.
He also played Norman Bates himself, in the 1987 TV movie
Bates Hotel. And he was a stunt actor (I'm assuming for Anthony Perkins) in the second and third movies.
He has done a few non-Psycho things in his career, though. They don't seem to be listed at tv.com yet, though.