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The advantages of an electric float gauge are:

  1. ease of manufacture
  2. independence of the indication relative to the variations of the aircraft power system if the measurement is made by a ratiometer
  3. independence of the indication relative to the variations of the aircraft power system if the measurement is made by a galvanometer
  4. independence of the indication relative to temperature variations
The combination regrouping all the correct statements is:

1, 3 and 4
1 and 2.
1, 2, 4.
1 and 3.