[427sharpe]

When I added a gauge to my car, I found the best way was to mark the gauge location with a soap stick (like tailors use), then to cut the leather with a flat, very hot and thin palette knife. It will sear the leather and the padding instantly (no rips or imprecise cuts) and then you can remove the circle of leather you cut and use a very sharp metal punch on the dash, which will leave a straight, clean edge. Install the new gauge, voila. I dont know if your tool selection is broad enough, but a second option is a die cutting wheel. You drill a small pilot hole centered where you want the gauge, assemble the cutter and screw it together. It will cut anything, and leave a perfect hole. A machine shop will have them, and maybe you can rent or borrow it...there are quite expensive to purchase. My set for work ran about $900. You can purchase a similar kit from Northern, but it is a flat punch set. I have a set of these for the house, and they are very nice..about $100 if I remember.