Wiktionary
tachometers
n. (plural of tachometer English)
Usage examples of "tachometers".
Its most distinctive feature is two columns of LEDs on the front panel that zip up and down like tachometers to convey a sense of how hard each processor is working.
It gives you the zooming LED tachometers that were such a popular feature of the BeBox.
Nor did he have to look at the tachometers to know they were creeping past their red lines.