Crossword Genius

Threat come wildly, with which to gauge revolutions (10)

Ross

I believe the answer is:

tachometer

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'threat come wildly with which to gauge revolutions' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'threat come wildly' is the wordplay.
'wildly' indicates anagramming the letters.
'threat'+'come'='threatcome'
'threatcome' with letters rearranged gives 'TACHOMETER'.

Can you help me to learn more?

(Other definitions for tachometer that I've seen before include "It measures revolutions" , "Instrument measuring speed of rotation" , "Teacher Tom (anag.)" , "rev counter" .)

I've seen this clue in the Sydney Morning Herald.
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