My 150 mph speedometer (1971 Z28 Camaro), began clicking with needle bounce, then stopped working. Now it appears to work correctly up to about 40 mph, then falls back to 0 mph. Anyway, I'm going to pull the speedo out, but need a recommendation as to where to send it for repair. The gauge face is in great condition, just needs the mechanism fixed I think. I know of "Gauge Marks" but don't know if they do repairs to mechanism. Also know of "Tachman" as a possibility. Thanks for suggestions.