OK so if you have seen Plasma Dials for sale from autotint?
Here's how to fit them into the dial housing, i did this to set of SRi dials.
Tools needed: junior hack saw, sharp Stanley knife, some side cutters/pin pullers (to cut with)
First off start with any of the dials by un bolting them from the back.
I started with the speedo.
Using side cutters, or some pin pullers with a sharp edge on them you cut two slots the correct size for the connector on the dial edge, then this bent over out the way *note you can file it so it's not sharp*
This basic presider is carried out on all of the dials, pre place them to determine on ware to cut the edge first.
They will with some guidance slide over the needles without removal of the needle, i used a small amount of supper glue to fix them in place.
Now this is the part ware you need to cut slots into the housing for the wires, easy as pie with a knife and hack saw.