Quote:
Originally Posted by bigblockv6
Even if you can't find the exact Tach you can go with a Sun RC 5000 rpm Tach the numerals are not quite the same but the overall appearance is very close, here's a pic of the Sun Tach I purposely stuck in the Cluster for comparison. 
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Then again the numerals on the factory GMC/Sun RC 5A Tach actually match the 55-59 trucks more so because GMC just carried that Tach over to the 60-66 models. There was another Tach used by GMC from 55-59 that was a full circle Tach, extremely rare and that would have been the better Tach to carry over to the 60-66 model trucks.