Please help battery light comes on with abs,brake and air bag
 

I love my monte carlo I have the 2004 intimidator with 260,000 miles running super strong still .I bought it 8 years ago with 22,000 i drive a lot for work all highway miles. That being said my battery light cam on last week so I figured it was my alt. Because I never changed it it needed to be changed any ways I can't believe I got 260,000 on it. But anyways my charging system is perfect new battery and alternator. When my battery light and my abs and brake and air ag light came on. I had the charging system checked and it passed. So my question is to you guys I'm being told it has to do with my gauge cluster going bad the lights come on and go off and my gauges go back down then go right back to were there suppose to be. My performance is all perfect runs super strong this is kinda driving my crazy please help ANYONE THANKS FOR YOUR TIME AND GOD BLESS.

No ones has had this problem?? I'm being told it's my gague cluster going out. Everything else in the car in acting fine