I wet sanded my buddies computer monitor. His daughter's friend took a tack and scratched a square right in the middle of it. Wet sanded the scratch out of it, buffed it with 3M compound, 3M Micro Finishing compound, then A polishing liquid, then glaze, then furniture polish. The plastic over your spedo etc. wont need allot. Just use 3M Mirco finishing compound or = other brand. then wash it with car soap, then polish it up good with furniture polish.