Many years back there was a shop in Denver CO named Deluxe Speedometer that did great things with old radios. The shop had been around forever and was a large AC Delco repair shop. The last time I was past their store it was empty, but someone informed me that they had just moved to a new and larger shop. Whether or not they're still around I can't say, this was maybe 6-7 years ago and I never followed up with getting the new location.