I just hardwired my 8500 X50 today....
and I too ran the wire along the windshield across the top, down the A-pillar, around the sharp little corner, back thru the small crack and down into the fuse box... I used simply a credit card and a small flat blade screwdriver being careful not to puncture the wire's cover.. tap into fuse 36, the wipers, as it is switched power... Go to radio shack, buy a $4 std. phone jack w/ 8" of wire attached, and you don't have to spend the 10+ from escort.. I'll post part numbers tomorrow.. wire the green on the plug from radio shack to the hot, and yellow is ground, in which I screwed the y-clip into one of the two screws holding the map light assembly up... I also ran an inline fuse adapter (also from radio shack) w/ a 2 amp fast burning fuse for protection.