If you want to change the way your HP Tuners nGauge powers up or stays off, this is how you configure that!
First: Power up your nGauge and from the Main Menu, select "DIAGNOSTICS>SETTINGS>SLEEP/WAKE"
Next: Select "SLEEP MODE" or 'WAKE MODE" and configure how you wish!
If you want the nGauge to always come on and shut off with your engine, set "SLEEP MODE" to "ENGINE RUNNING" and then "WAKE MODE" to "VOLTAGE LEVEL".