Tractor Gauge Glass Cut to Size Repair agricultural and vintage tractor instruments with clear round replacement glass cut to the diameter you require. Suitable applications include tractor speedometers, hour meters, fuel gauges, temperature gauges, oil-pressure gauges and other dashboard instruments. Phoenix Wing Mirrors manufactures 2mm flat glass in the UK, available in 1mm diameter increments. The front and back edges are wet-finished to produce a clean replacement component for original bezels and gauge housings. Tractor instruments can vary even within the same model range. Measure the original glass or the seating recess carefully before ordering, and confirm that 2mm thickness is appropriate.