Where to Tap Into the "on" for headlights for Gauges

[Foggy]

I have installed a new boost/vacuum gauge. It is really really bright at night. So I'd
like to use the dimming feature of it. It says not to use the dash lights as a source due
to that being a variable/potentiometer power. So I'd like to find the power source to
tap into that is "on" when the actual headlights are "on".
Thank You

 

[79jasper]

Depends, is it digital or analog? Led or incandescent?

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[exp500]

You could try nail polish to dim the LED.

 

[Foggy]

Depends, is it digital or analog? Led or incandescent?

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It's a digial LED boost gauge Innovate MTX-U

 

[Foggy]

It just needs the "signal" that the headlights/parking lamps are in the ON position to turn on its dim function

 

[79jasper]

Ah, I see.
Unless you keep your dash lights turned all the way down, you should be fine using the dash illumination. Or tap into the running lights.

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