Found some great tips & advice while surfing through the forum & wanted to share. My first post, I will attempt to include original links & some photos.
First, my speedo didn’t work. Found some troubleshooting tips which led me to buy a new paddlewheel assy. That didn't work so I got a new speedo which now works when the paddlewheel is spun. $79 and it looks nearly original, only slight differences. The new one plugs right into existing harness - the old one had a harness to the original plug.
Since the dashboards looked pretty worn, I tried some conditioners which did not work very well. I acted on a tip & painted both dashes. The paint was specific for plastic & looks and feels like it will last.
Here is the original link: