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change the lights in the dash. I believe the bulbs are 194's (common GM size) but then again ive never swapped them on a tahoe so you might wanna get a second opinion on that.
When i had my s10 blazer, i removed the gauge cluster and replaced them with green 194 bulbs (the vehicle was green).
just my opinion and dont take this the wrong way, but i would be careful with how much accessory lighting your doing- if it is overdone it can start to look tacky. Best of Luck.