Good looking truck, and, for the most part, your list of pieces sounds OK. I've heard that the fuel pump you're planning on using only puts out around 45 to 48 psi. I've read a few of the Amazon reviews for it awhile back when I was thinking about going with it, and several folks said it wasn't quite enough for the LS motors - especially if you have 350+HP. The nice thing about the pump is that it's the last of it's year (1996) that's for EFI and fits that sending unit you got. It just might not crank enough juice.

Your gauges shouldn't be had to hook up at all - you have the newer gauges where mine has the real old stuff, and I was still able to make that crap work.