Hi Ron,
What is it I am overlooking.
Certainly not caution. Good question.
Dash pad should be held on by two metal clips that wrap around the top right and left edge of the dash. You will see them, or feel them under the dash lip.
Unscrew the two mirror bolts and remove that small dash mirror... that seems useless when the top is down. (did I just type that, or was I thinking that)
The dash pad is also held in place by the 3 pegs per each defroster. Those pegs line up into holes in the dash top.
My dash also has 4 Tenax studs, for the Tonneau cover. One in each corner and one on each side of the dash mirror. My studs extend through the dash pad. I believe there are holes in the dash top to allow those studs a place to go, so as the dash will fit flush.
Things that still may hold it down:
The clips may still be holding it or keeping the dash from moving up and forward. The dash pad has to raise up enough to clear the above items that extend into the top of the dash.
Dash pad is stuck to the dash top, because of age. Try and gently pry up.
PO may have screwed it on, from beneath.
Attached is a photo of the bottom of my dash, showing the 3 pins that extend through from the defroster vents and one of the Tenax bolts that is near the dash mirror that is effective only when the top is up. (am I thinking out loud again?)
In case your wondering what the grey strip is on the leading back edge next to the defroster vents, it's a self adhesive foam strip I used to keep the dash pad from vibrating against the dash top and windscreen.
Good luck Ron, Roger