Initial disassembly of the speedometer shows the major components.
The speedometer and tachometer are completely disassembled in order to access and evaluate the condition of all moving parts.
Here you can see the intricacy and delicacy of the speedometer's components. Just looking at these pieces should convince you that speedometer overhaul is not a DIY job.
Restoration begins with media blasting of the various housings to restore a like-new finish that will stand up to the toughest NCRS and Bloomington Gold judging standards. The technicians at Corvette Specialties are always careful to preserve original part numbers and other stampings that appear on the backs of the gauges.
Odometers and tachometer rev counters, where applicable, are completely disassembled, serviced/repaired as necessary, lubricated, and reassembled. Brian and his team are able to replace counters that are no longer serviceable, and he cautions that others in the business who do not have access to correct parts sometimes use counters from passenger cars of different years and even from other GM car lines. The numerals on these "replacement" counters may look significantly different than the original Corvette units and cost points during show judging.
This photo shows a broken hair spring on a speed cup, a common failure on these speedometers.