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Click on image for the lowdown. 
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Mod | | | Forums66 Topics128,139 Posts1,056,451 Members48,441 | | Most Online14,466
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!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Mar 2014 Posts: 4,501 Moderator, Electrical Bay | | Moderator, Electrical Bay Joined: Mar 2014 Posts: 4,501 | There were usually only 2 connections on the S10 HEI (at least the one I owned)...as I recall one was red and one was green. Green fed impulses to the tach. I expect the green wire would connect to your brown wire and your pink wire would be + from ignition. Ground would be the instrument cluster although I can't tell what that other wire is in your image up there. Good luck.
~ Jon
1952 1/2 ton with 1959 235 | T5 with 3.07 rear end
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