Im trying to figure out how to dim the interior dash lights dimmer than go now. My wife has the '07 Yukon and it only goes so dim. I have a '06 Hummer H2 and I can turn off the dash lights. Didnt know if there is something to do to dimming knob to make it dim further. We got limo tinted windows on the Yukon and the dash almost reflect on the inside with them dimmed on the way. Any Suggestions?