Frankentach
 

So almost a year ago i had found a tach dash but the tach didnt work. Was from a 1979/1980 gmc (didnt pay much attention). Took a circuit board out of a 1983 or 1989 (we coudlnt figure it out, the junkyard had to years llisted on its windshield) firebird with a v8, and placed it onto the tachometer instead of the burnt out stock one. Lo and behold it works!! Ill post pictures tomorrow hopefully and have a video of it working.