Marine Instrument Glass Replacement Replace damaged flat glass in boat and marine dashboard instruments, including speed, RPM, fuel, temperature, pressure and navigation-related gauges. Clear round replacement glass can help restore visibility while retaining the original instrument and bezel. Our 2mm flat glass is precision-cut in the UK in 1mm diameter increments. Each piece is wet-finished on the front and back edges for a clean fit into suitable housings. This glass is supplied as a replacement component only and does not itself waterproof an instrument. Correct sealing and installation are essential in marine environments. Measure the original glass carefully before ordering.