I have used Instrument Specialties in Rhode Island for SUN tach and gauge face repainting. Ask for Thomas.
I am not sure if they have worked on Stewart Warner, but would guess they have.
http://www.instrument-specialties.co...uges-clusters/
Here are a few pictures of repainted faces they have done for me.
The look is original, but SUN never did what one of my friends wanted !!!
Hope they can do what you need.
Dominic