Wayne has had some success with drilling the cap, I went and talked to him about it and he showed em how it was done. However, he has also run into some failures down the road after some miles have been put on. Apparently they start to leak.
So, after much thought and heartache I decided to drill my valve cover. Yank it off, clean it up real nice, drill the "R" drill bit hole, tap it with the 1/8" NPT tap and clean it up again, reinstall and your set. I did that with mine and 6k miles later I have NO leaks anywhere with my bypass.
OK, OK, 6k miles isn't squat I know. But this method worked well for me. Drilling the cover took some stones, but hell if I screwed it up I could just buy a cool colored one right?
The amsoil swivel fitting doesn't fit by the way without lengthening it with an adapter. I have an extra one if anyone is interested.
Another fella on here said that a 2000 Nissan Xterra oil cap fits our trucks and the cap works with the amsoil swivel no problem. I've yet to verify this.
Good luck.
CPFF also makes a nifty mount for the bypass. It encases the battery and mounts where the battery mount does. It's quite a nice piece, 60 bucks though. I have one and I like it.