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does anyone know if the printed circuit board feeds the factory tach or not.my printed circuit has a portion on the left side (looking at the back) that has been fried or something(no longer a circuit)and was curious if this maybe the problem.i hooked up the brown wire in the engine harness and the car wouldnt start but the tach seemed to jump a little bit as the engine turned over.how hard is it to replace the printed circuit board anyway.has HEI now

1967 RS/SS 396 M22 factory tach

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