The Faze FZ3114 is a 2-inch (52mm) analog mechanical vacuum/boost gauge featuring "Reverse EL" (Electro-Luminescent) backlighting. It is designed to measure negative engine vacuum up to 30 inHg and positive turbo/supercharger boost up to 30 PSI. [1, 2, 3, 4]

Because this gauge is mechanical, it reads pressure directly via a physical line rather than using an electronic sending unit. The "Reverse EL" designation means the faceplate remains dark while only the numbers and tick marks glow (typically in a luminescent blue or green) when powered