I have this one mounted on my truck I found it on a '52 I bought for parts. I didn't drill my dash but cut the screws flush and glued it on with acrylic caulk so I could remove it (I centered it between the gauge clusters).
Original location:
http://good-times.webshots.com/photo/2888466550102454676YjhoMM
Close-up:
http://good-times.webshots.com/photo/2515462660102454676AkgUKk