Tach

Any body have one of these.? You cant seem to turn off unless you take battery out. Is this correct.?
Does it start reading rpm when the motor starts running or do you have to turn the tach on? On racing tachs they shut off after a little bit or you can choose to shut them off right when you get off the track.
 
This is correct for the ones I have.

Have some more than 5 years on same battery.
Shows hours of operation when engine not running.
 
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