I got a bit of experience with LED's from this site. The bloke that runs the site is very helpful. He's a member on VVOC.com. I got a full dash kit for my Veccy and it was spot on. If its any help i don't know, but the LED's used behind the speedo and RPM clocks in the vec are these
https://www.crazyleds.co.uk/product.php?productid=163&cat=67&page=1 Im using the same kit to do my omega over the weekend. The above LED sits in the bigger of the bulb holders, and is more than capable of lighting all it needs too. And it looks S**T HOT at night. I went for white, and was well impressed
It might be too late, but i'll let you know how i get on with it when i do it