Technical Gauge repair

Who do you recommend for testing and repair of vintage big block SW gauges? Thanks

 

Williamson's is one possibility. They converted a clock to 12 volt quartz for my '54 Ranch Wagon. Fair price and good communication. Not the quickest but they got the job done.
Williamson's Instruments, Inc. - Gauge Repair, Restoration (williamsons.com)

 

Thanks. I am very aware of them. They converted an old Sun Tach transmitter for me but it took months. Looking for other shop possibly.