LRI Probe. Sudo angle of attack indicator for an airplane. These things have gotten ridiculously expensive. Ports are sized for 1/16 NPT but must be tapped. Use 1/16 NPT to 3/16 nylon hose barbs and some Teflon tape to seal the threads. For a display use a 2 1/4" low speed 0-80 mph Falcon airspeed indicator. To calibrate it use a U shaped plastic tube as a manometer to find the indication in inches of water column. Put water in the bottom of the "U" and attach tube the to "Pitot" input. Adjust the tube so that there is a 1/2", 1", 1.5", etc. difference in the water on each side of the "U" and note the needle location. Tap on the indicator so the needle will settle out. The front glass may be removed with a 1/32" steel sheet cut to width. Use black testors paint to cover over the airspeed numbers. Use white, red, green, and yellow testors paint to color the LRI gauge. Works perfectly.