I put a full dash cap on my because of the cracks. I had to trim around the glove box door and the gauge cluster.
Follow the directions and clean the pad really good,and scuff the back of the cap. Use clamps,duct tape ,whatever it takes to hold it in place while the silicone cures. I had the dash out of the truck too,and it makes it easier.
If I do it again,I would probably go with a half-cap.
It's not going to fit perfect,but it looks better than cracks.