Teleflex Vector Instruments. Hot New Performance Gauges. These high precision instruments are elegantly styled with crisp blue and white graphics on a deep charcoal background with black bezels. Built for the marine environment, these instruments offer classic Teleflex features such as precision vector movement, reverse polarity protection, and perimeter lighting. Tachs and speedos: 3-7/8" dia. bezel; require 3-3/8" dia. hole. Gauges: 2-3/8" dia. bezel; require 2-1/8" dia. hole.