Fiber optic post lights have a standard 8-32 thread and mount in the top left instrument securing screw. Use one light source in 12 or 24 volt, red or white light, and up to 12 post lights to light instruments. Bright light without a drain on power. Estimated 100,000 hour life without bulb change. Simple installation without having to remove your instrument panel. Illuminates only the face, not the whole panel. Simple wiring with only 2 connections. Post lights are 1″ long and the light head protrudes only 1-1/16″ from panel. Order 1 source and as many post lights as needed, discount on 8 or more 30 inch length PL-1 or 60″ length PL-1-60.