I'm unsure of the gauge as it was left over aluminum plate a friend had. When set into a dash recess it just sits below the edge. I like aluminum because it's so easy to work with, and easy to polish up. I picked up another dash and plan to rework it so my pushbutton starter is beside the key and I have another mounting area for switches. Not over the top but cleaner.
I would love to see some pics of yours, you can use my e-mail,
jwebster@tnt21.com.
John.