Hi Jarrod, Don't know if this will help or not but my nephew has a new Year One repo tach and wiring harness for sale in the For Sale forum.. http://www.v8buick.com/showthread.php?p=551095#post551095 Thanks...
Jarrod, M&H Electric Fab Inc. has them # 17250 Hood tachometer harness $ 16.00 http://www.wiringharness.com/