My father in law has a 1980's 3040 JD Tractor he recently purchased, but has no book with it. On his instrument panel below the fuel gauge he has 6 indicator lights, we cannot find out what the bottom right one is, right below the light indicator. It is a circle, white inside with black dot in middle, and on the left side it has approx quarter circle beside it. I will be back to a JD dealer later this week, but thought you all might give me an answer. Thanks for your assistance.