That's what I'm talking about Jerry. There can be no errors in certain fields. That's why Aircraft have triple redundancy. Three different harnesses for the same thing. Run in three different places on the aircraft. That can be the case for wire cables, hydraulic tubing, instruments and so forth. No matter how electronic the cockpit instruments got, (LCD Displays and etc,) the chief pilot or military office wanted a glass bubble for inclinometer/turn and bank, a barometric altimeter, pitot tube, magnetic compass and a flash light. For when the "lights went out" sort to speak. No electricity needed for those. The last plane I worked on had all that.
