Mounting LCD to Dash
To mount the fiberglass LCD shroud that I made to the dash, I fabricated some brackets. These brackets attach to the dash frame behind the stock gauges. The shroud is bolted to these brackets from the outside. This allows the screen to be removed in the future if needed and the stock gauges reinstalled without replacing the dash.
The brackets are fabricated from some steel bar stock that I picked up at Home Depot. It's about 1/8" x 5/8", and is plenty sturdy. The bolts I made out of some threaded rod.
The bottom of the L shaped parts bolts onto the dash frame, and the screen is attached to the holes in the horizontal piece.