You may want to do a
, this topic has come up a few times.
I have used PA Speedo twice, once to have my my Speedo refaced to 150MPH, and again to repair and reface my tach. Excellent service, and quick turnaround.
The 2 main places that do VDO repair on the West coast are Palo Alto Speedometer and North Hollywood Speedometer.
http://www.nhspeedometer.com/
Both have an excellent reputation.
I used PA Speedo because they are local.
Tom