I thought I read about this problem on GMT but can't find it now. Driver Info Center goes dark and gear select very dim. Happens randomly. I thought I read something about check grounding and said to myself, self, need to remember this in case it happens to you. If there is a current thread please link me to it. '07 Tahoe, 5.3, LS. Only change I have done recently was adding trans cooler and plug in Range Tech box into OBD that defeats DOD and AFM. Thank you.