I got mine in '07 as a graduation present to myself.(cabpatch) I know what you mean about empty spots in the triple pod though, I was gonna go that route when I got my boost gauge but couldn't bear the thought of empty pods! So I just mounted mine in the center vent and got a Dashhawk, so I can basically monitor whatever a gauge would have (and does a bunch of other fun little things).
I posted a couple pics earlier in this thread and if I remember right one of them was a pic of how I did my boost gauge. I'll take some more soon after I get my latest batch of toys installed...Rho-plate, HD Lip, and new wheels/tires (hopefully Enkei 19's, fingers crossed).
Upload pics when you get a chance, the black Speeds look so BA.