Ouch, those are pretty expensive!
I used
http://www.newvintageusa.com/ Woodward series gauges.
They look pretty like the original ones.
At $425 they're a
lot cheaper but unfortunately are not a true bolt in.
There's a bit of work to get them to fit.
You can add on B*llet mounting rings(more $$$) or sacrifice your original gauges to make mounts for them.
Here's how mine turned out.
http://www.flickr.com/photos/2601498...7622841898720/
Oh...... and they work great!