B & S Mystery Tool - What is it

[Tempus_Fugit]

Hello, I am more of a mechanic than a machinist.

Does anyone have any idea what this is? Picked up at an estate sale for basically nothing.

thanks,

TF

 

[4xdog]

Tachometer.

 

[Davefr]

Tachometer.

Not quite. It counts total revolutions vs speed of revolutions.

 

[larry_g]

Rev counter.

lg
no neat sig line