Mine does this. When I first installed them they would both turn on and now I have to manually press the button.
Since we are on the topic about these gauges , I have a question for you guys . I bought a single aeroforce gauge for my car a couple years ago from lethal and now I want to install another aeroforce gauge . What do I need to add a second gauge , just buy another gauge and buy a obd2 splitter . Thanks for the help