Tom,tips for the holesaw. Check that the 1/4" bit extends just a little past the cutting edge of the saw,you can adjust it by loosening the screw on the arbor. Remove the arbor,fold back the insulation on your firewall enough for the hole,don't cut it off so if you want to remove the Psy. you can cover the hole. Put the hole saw in position so it's only drilling thru 1 layer of metal,you can then screw the arbor in and it will make a mark at the center of the hole,you may want to twist it back and forth to make a good mark. When using a holesaw I always drill the 1/4"pilot hole first,if you don't when the pilot drill pops thru the holesaw will come down hard and bind,if your drill is strong enough it will twist the drill out of your hand. When cutting the big hole apply gentle pressure,it will feed itself. After the hole is cut use a deburing tool or a round file to remove the sharp edge. I used touchup paint on the cut edge to prevent rust. You're ready for your Psychotty!
------------------
95' 25004X4,AT,Driftwood,Banks Stinger,Warn fender flairs and running boards(Play truck)95 3500,5 speed,Driftwood,Banks&Phscotty,34,000 GCVW apple and tractor hauler(work truck)