Thanks! MoM, you don't have to create a new thread
You're not going to like the answer, but here goes...
The tricky thing is that all you have is the original part. On the Conion the lettering is printed on metal trim which can be removed, so it was easy to capture with a flatbed scanner. Your Hitachi has them applied right to the case, so it might take a really good closeup picture. Thankfully in most cases the fonts are online to be pilfered. I then typed in each letter I needed into Inkscape, which then traced the letters for me, which essentially converts them from being a bitmap to a vector, which is just a fancy way of saying the letters are described in terms of an outline defined by x-y coordinates, rather than a pile of pixels spread out to create the shape of the letter. I also had to do this a few times before they were correctly scaled.
Even after you get a scan, the lettering may be all scratched up (as it was for me) so it's only useful as a positional reference. It's also hard for most tracer programs to find edges in images. It's best to start fresh with crisp original text and recreate it all by hand. It took quite a while to redraw all of the little lines, circles, dots, etc. and get them all centered on the original scan. If done right, the end result is extremely sharp and has no jags from pixels.
I did all of the graphics work in a high-end CAD tool, but I'm sure there are other tools that are equally competent like Illustrator or other CAD programs. With the original scan in the background as a reference, and a micrometer in hand to confirm things on the original part, I just redrew all the stuff and positioned my letters over the old ones.
I'm leaving out a number of steps but that's the basic rundown!