telltale
n.— «The replacement part turns on a little telltale next to the odometer display indicating that the part has been replaced.» —“Re: reprogramming digital odometers” by Mike Griese (magriese@polaris.rchland.ibm.com) Usenet: rec.autos.marketplace Apr. 7, 1995. (source: Double-Tongued Dictionary)
Further reading
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