At the moment is run to an unpainted dash support strut that's bolted into the tranny tunnel. (Yeah, ok, it's a FWD car, but the shift linkage still has a tunnel...). Looking around under the dash, the dash supports are used as ground for other stuff, and I think that's as good as I'm going to get without either running out to the battery or drilling myself a new hole in the floorpan. I'm lucky because the strut has had material removed to lighten it so I've just been able to run a 5/16 bolt straight through it and tighten a nut on the other side.