There are a lot of posts on here about doing it. I have been considering it for a couple of years. Here are a couple of links. Some are for other models but they all work the same.
I thought I had saved some other links but can't find them now. There are several methods used. Some people mount the servo under the empannage fairing and run a new cable to the trim tab. One guy put the trim cable up under the panel to drive the normal manual trim cable. I think he had to modify the trim cable end. Check the drawings too. The control horn on the trim tab is larger for one application than the other. I don't remember which is larger. I think it was the electric trim setup but I read somewhere that people have done the conversion successfully without changing that control horn too.
I keep thinking about doing it but I have not felt like messing with the wiring. I am capable, just not enthused! Good luck and let us all know what you do and how it goes.