[Yetiman]

I added one in my Arntz to run the G-tech pro. I bought one from an auto parts store for $9 that had ears on it to mount on a flat surface. I mounted it to the top of the passenger side foot box a ways back so it was out of sight. I added a fuse holder inline, and went to a power block I had on the top side of the footbox (which I put in myself when I added the MSD type box).

Not too hard to do. The Gtech pro works great and seems to be quite accurate.