VDO Gauge Glass Replacement Restore VDO speedometers, tachometers and dashboard instruments with clear round flat replacement glass precision-cut by Phoenix Wing Mirrors in the UK. This page is intended for owners and restorers replacing scratched, broken or missing instrument glass. Our current glass is 2mm thick and available in 1mm diameter increments to suit a wide range of VDO gauge housings. Each circle is wet-finished on both front and back edges for a clean, smooth result suitable for careful fitting into the original bezel. VDO instruments differ across vehicles and production years. Remove and measure the original glass whenever possible before ordering.