Baba this is a problem that seem to comes up quite regularly.
Thanks to an idea from fellow 'bolter Dan Bowles I fitted my
New Vintage Woodward series gauges using his technique.
Like Project Helen says,there are billet adapters available but at a price.....
Assuming your old original gauges are kaput and you don't mind cutting them up you can use the original shells as housings.
Here's how I did mine.
Retro-fit gauge installation.I'm really pleased with the end
result. I hope this helps.