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It is an intrinsic part of the IFR instruments. As long as you keep the needle in the circle and the flag says "TO" (that's the red thingie), you are on a radial (a radio beacon, marked on a chart as a line) TO the airport. When the flag flips from "TO" to "FROM", you just passed over the airport beacon and are now on a reciprocal heading AWAY from the airport...turn around to land or make a procedure turn to your next heading (if using the radials to navigate).
That's if I can remember correctly...I have never been IFR rated and only sometimes flew a plane with such instruments. BUT! I have read books on the subject and hangar-flown with other pilots who are instrument rated so I have at least a working idea of what those "other" gauges do.
Brian
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