The M-1 is a precision manifold pressure instrument featuring a 210 degree graphic analog display and a digital display. It measures absolute pressure in the engine's manifold to .1 inches of mercury on the digital display. The M-1 enables the pilot to make precise throttle adjustment for maximum performance during take-off, climb, and cruise. The M-1 is easily installed by connecting to the aircraft's existing line through a 1/4" flare union on the back of the unit. Backlit and operates on 12 or 24V. Wt. 13 Oz.