Two that I can think of are the Tachman, Tachometer Repair Restoration for Antique Classic Cars Auto, and Mr. G's, www.mrgusa. I've had Tachman do work on a couple of instruments, sweet work. I have also seen a Mr. G's set of panels that were redone, they were quite nice.
The big issue of late seems not to be the rechroming, but getting the details painted (there is an argent painted ring, as well as the flat black.) If you're talking to different vvendors, make sure what all is being done, before you compare the prices.
I saw when I added that link that he re-does the wood grain. I have a bunch of panels in the basement that could use the help.
I had a hard time finding originals in good shape, since this was before Tachman advertised the service, ad they are starting to seem fewer and farther between.