the only gauge I put in the inside of my gt 500 was the raptor shift light which is the size of a lipstick tube and has led lights so is very bright for a shift light- never liked the in dash light and this helps me a lot because it is easy to see and easy to install. No holes required and I have it on my dash pod and in my glove box when not in use- I may put is on the pillar but would have to drill on small hole but the pillars are easy to replace and run around 53.00 . Check out raptor performance - google it rs