Gauge is analog and measures 2-1/16" in diameter A 1/2" npt capillary tube end adapter include Features a polished stainless steel bezels 12V backlight improves nighttime visibility Capillary tube is available in 48", 60" or 72" Stewart Warner Deluxe Series gauges feature black faces with white lettering, polished stainless steel bezels and 12 volt back lighting for night time visibility. 1/2" npt capillary tube end adapter included. Specify 48", 60" or 72" capillary tube length.