telltale
n.β Β«Theyβve got a “tell-tale” tracking needle on the tachometer. Shows you the highest RPM a driver just reached on the track.Β» ββStuddardβs Ambition Burns On: At Age 51, SCCA Driver Wants to Try NASCAR” by Bill Robinson Atlanta Journal-Constitution (Ga.) Oct. 15, 1989. (source: Double-Tongued Dictionary)