Dimensions
The idiot light pods are 1.75 inches wide by 4.5 inches tall. The space to install guages is 10 inches wide by 5 inches tall. These are approximations but otherwise pretty close.
I don't think there is enough room to put two 3 3/8 guages plus a 2 1/16 on each side and still retain both idiot light pods. (3.375" + 3.375" + 2.0625" + 2.0625" = 10.875" alone. Not counting any space between them or if the guage bezel is a bigger diameter). I think it's only doable by losing one of the pods. Half of the lights don't even apply to us or have any bulbs in there. I think BFH(Buick from hell a.k.a. Kevin) can make an idiot light overlay with anything that you want on it.
HTH, CaptRob
I'm in the process of doing this right now. Pics soon. I just went to the JY and snagged a inst panel from a N/A Regal to cut on.