Check that your "instrument voltage stabilizer" actually puts out 10 volts. If your temperature gauge and fuel gauge are getting 12 volts, then they will read high. One surefire way to tell if this is going on, is to check the fuel tank readings for various actual amounts of fuel in the tank. If you put in 5 gallons and it reads about 8, and you fill it and the gauge goes way off past the full mark, then your instrument stabilizer is toast (or, like mine, it’s just not properly grounded).
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