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Click on image for the lowdown. 
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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Aug 2006 Posts: 30 Wrench Fetcher | | Wrench Fetcher Joined: Aug 2006 Posts: 30 | I would connect the B+ to the ignition switch, so it's powered with key switch on. There is no value in feeding it with live battery power
I would connect the S to the points wire post on the Ignition coil. To me S means signal. Signal is provided by the points "pulse". 4, 6, and 8 cylinder are different, certain resistors are used to make the tach read correctly.
The case should be grounded.
There may be a connection for a light.
"Nothing is ever as simple as just turning wrenches!"
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