What is this light for again?

[EDDIECSL]

Fellow Zilvanians,

Quick question wtf is this light for again?

The yellow round one in between the ignition and the hazards button.
Been scratching my head over this for a while , finally decided to ask.

[cbeuglas]

Overdrive light car was an auto at some point.

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[EDDIECSL]

You hold your tongue!

Oh man i didnt know that. Thanks a butt load man.

Regards,
Eddie C.