I really don't know much about this tach.
It does move the needle when I spin the cable.
I'm fairly sure it would run off the distributor, but I never used one like it. It came with a bunch of things out of an old mechanics shop.
Ideas on the year?
__________________
Rick
69 Chevelle SS396 Silver L78 M21 Post Sedan (Berger Chev.)
69 Chevelle SS396 Black L78 4-speed 4.10 Post Sedan
Don't text and drive.
Somebody's life may depend on it!