I've just finished installing them thanks to a tip from fellow Stovebolter/HAMBer Danimal.
They're just slightly smaller diameter than the originals but IMO look as near factory as I've seen for aftermarket gauges.
The wiring was really simple although I've yet to run power through the system.
I'd better not let the smoke out the wires! wink

1950 Chevy Advance Design 3100 in Scotland
In the Stovebolt Gallery
More pix on Flickr.
I've definately got this truck thing in my blood ... my DNA sequence has torque settings
"Of all the small nations of this earth,perhaps only the ancient Greeks surpass the Scots in their contribution to mankind" Winston Churchill.