Gauge Backlight Question

Traffic22

So I am new here to the forums, been using all of the great posts, and DIY info to plan my audio system. I had it installed this week by a good friend who owns a stereo shop. He has done a number of installs for me before, and I have always been happy, so it worked out well. (Special thanks to the forum members for the window reset info.)

My question, and I feel really stupid for asking, relates to the dash illumination. I drove the car at night today for the first time since the system install. I noticed the gauges appeared to be illuminated even before I turned on the headlights. Once I turned on the headlights, nothing changed. They didn't get brighter or dim, just stayed on. When I got home and turned off the headlights, the gauges remained illuminated. Once I turned off the car, they went off.

Now I have only had the car about 5 weeks, and only driven it about 3-4 times at night, so I can't recall if this is normal? I never really paid attention before, and now I can't recall what is "normal."

If this is not normal, has anyone experienced this after an audio install? Solution?

FYI I googled this 27 different ways and did not find any info, so maybe I am just a bit lame, but you know how it is, just a bit new car nervous.