Select the edges shown in green and chamfer them by 0.1 or so.
Starting on the lower half of the dahsboard. Create a new poly as shown by the polygon outlined in green and then do a few extrusions in the direction of the arrows. Make sure it lines up with the top half of the dash. Throw a symmetry modifier on it and then collapse the stack like we did with the top part of the dashboard.
Select the edge shown in green and extrude it upwards as shown.
Use the "Connect" tool to cut in the edge shown in green.
Make the cuts shown by the green lines. Now adjust vertices shown in red so that the geometry doesn't stick out.