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If your question is only about the dash light,
The dash light will come on to let you know that the O.D. is ready to engage. It doesn't mean you are in Overdrive. All the light means is that the engine has met the minimum temp requirement (about 150 degrees or more) and if your O.D. unit is functioning properly, it will activate in 2nd, 3rd, and 4th gears above ~1500 rpm as long as you're not heavy on the accellerator. Hit the gas hard in these gears, and the overdrive will shut off until you reach cruising speed (much like cruise control).
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