my cluster was maybe 1/8 inch thick, its not thick at all, a dremel tool should cut trough it like butter.

of all the gauges out there, you want a oil pressure gauge.

never touched that plisti dip stuff, but that also could work out.

with any luck maybe you can flush mount the idiot lights in the metal and place them around the cluster, or relocate them elsewhere.

just had a brain fart, lol if you were to tint clear plexi glass for a cover plate, then the idiot lights would shine through the tinted glass and be out of sight if not lit. thinking out loud....like i said the skys the limit on ideas. its all left to your ability's and budget.