I added a shaker to my Dr. Who. Here is the post that may give you an idea of what is involved.
Also check out the T.I.L.T. mods interface board. It was not available when I did my mod but I now have 5 of them in my tool box for future mods and extras.
https://pinside.com/pinball/forum/topic/tilt-mods-deluxe-bring-your-mods-to-life