I'm using a cbr f4i gauge on mine, most of the wires are directly compatible, you just have to line them up in the plugs (which takes a couple of wiring diagrams and a little patience, but isn't hard at all). Picked it up for under 100 bucks at a junkyard and the thing is very small and works well. People have done it on here with 929rr and 1000rr gauges as well.

I haven't done a single bit of welding on my bike! It's on the list of skills to learn, but takes time, facilities, and proper instruction and I haven't lined the three of those up yet. You'd be surprised what you can make with metal shears and aluminum sheeting and a few bolts. And make it look good! Also, if all else fails, zip tie the snot out of it.

I can't remember who, but someone on here cut their speedo off, covered the hole and the gauges looked really good. Significantly smaller and very unique. Plus there's a cool factor to not having a speedo...