Good morning Scotialaddie; I just used the search box at the top right of this page and put in, Nason parking brake switch, and this is what I found. I would go to their web site,
www.nasonptc.com and see what info you can find. Most but not all the switches for the Monaco products seem to be # SM-1C-66R/WP28. Not sure this is the one you need. I would go to their web site to make sure. This should get you going and hope this info helps. Good luck and have a great weekend!