I was told about a automotive instrument repair shop in Tacoma or Seatle that does old car instrument repairs along with the more common repairs, I can't remember the shops name now but they told me about another speciality shop down in L.A.,CA for after market Sun electrical instrument repairs like I wanted done. I ended up buying new VDO instruments for that car instead of spending more for the repairs than the new ones cost
I do have one older (mid 1970 to mid 1980s or so) Mallory electric tach that the needle fell off that I may have done for my 1963 Plymouth Fury some day once it is back in line for finishing