BMW,
1. Just remove the surrounding covers from the gauges
2. you will see the 2 bolts that hold the gauges at the bottom, use a 8mm socket to get those out
3. cover your top tripple with a microfiber or two, as you will pull on the top part to get the gauges out, and i bet you dont want to hit the gauge cover on the top tripple
once the gauges are free frm the front stay, pull the boot on the connector and then pull the connector by pressing the tab in the middle..
4. regarding the webslingler gauges, I would recomend staying away from glueing the little needle stopper he provides, if glue gets past the holes, it will ruin the gauges.. ask me how I know
5. on your factory gauges you can remove the needle stoppers with fine needle nose pliers and mount them on the new gauges after maybe cleaning the edges of some of the holes.
6. one other point is to ensure that the center bore of the new gauges fit in the neddle base, if not then the needles tend to get stuck. again you can clean this bores out with regular hobbiest sanding rods...
good luck