Dash pad cap installation

I'm at the point in my 69 Dart resto where I am doing the complete dash while it's out of the car. The original dash pad is stripped of the original ratty cap. Pretty good condition. Years a go I bought a dash cap from Year One or Classic, I don't remember off hand. What is the procedure to put on the new cap and what adhesive would I need. I tried looking for a video on Youtube but didn't find one. I will try to post before and after pics. Thanks.
my dash was cracked pretty bad , found a dash cap on eBay way back when I was building the car .
I took a rough cut file and a very sharp knife and cut/filed the cracked plastic down to where it was even ,with no raised places or humps , it came with a small tube of clear sillicone for glue , I added quite a bit of clear to go with it , but not close enough to the edges to smash out , had short boards and weights ready to leave in place overnight , still looks new and original 14ish yrs. later ...