VDO Vision Black Gauges use fiber optic technology to illuminate gauge pointers for unmatched readability, and they feature VDO's tri-optic through-dial lighting for superb night clarity. VDO Spin-Lok mounting provides maximum flexibility and easy installation without brackets, nuts, or washers by using a spin-on clamp to hold gauges with 360° of force, preventing gauge rotation and panel warping. Mechanical pressure and temperature gauges include metal housings with U-clamp brackets.