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The first place I would look would be to pull the wing panels just outboard of the fuselage, the round ones right at the leading edge. In those holes you will find a big white plastic plug . I would clean all the pins with contact cleaner, look for corroded pins. Sometimes the pins are worn and don't make good contact. With the plugs connected, power on the plane and wiggle the wires at these plugs watching for erratic guage movement. 9 times out of 10 thats where the problem is on our airplanes.
Hope this helps
Kim
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