Vision Black 15 PSI Mechanical Boost Gauge 12V. Crisp black dials and matching bezels, along with VDO Tri-optic through dial illumination make Vision Black a solid choice for small fishing and pleasure boats. High contrast clear white graphics and red pointers make Vision Black easy to read, while patented VDO movements provide smooth and accurate performance and long life dependability. Standard 0.25 spade connectors simplify wiring and VDO Spin-lok mounting makes installation fast and easy. Included light diffusers allow the dial illumination color to be changed to red or green. Features Input Type Analog. Mounting Hardware Spin-Lok. Voltage 12V. Diameter 2-2/16 . Diameter Metric 52mm. Max Range Outer Scale 15PSI Crisp black dials and matching bezels, along with VDO Tri-optic through dial illumination make Visio Input Type Analog. Mounting Hardware Spin-Lok Voltage 12V. Diameter 2-2/16 Diameter Metric 52mm. Max Range Outer Scale 15PSI