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GMC Astro tachometer pics for anyone curious

Posted By Modrob Friday, June 22, 2018 8:41 AM
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Modrob
 Posted Friday, June 22, 2018 8:41 AM
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Picked up a mechanical tachometer for my truck and it needed a little tweaking to work smoothly, so I took some pics for anyone who might need a better look sometime,
http://forums.aths.org/Uploads/Images/18289efa-856f-43f9-a2ab-d247.jpg
Modrob
 Posted Friday, June 22, 2018 8:42 AM
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http://forums.aths.org/Uploads/Images/a7b9ad0e-00f1-4db7-b4cd-6d6c.jpg
Modrob
 Posted Friday, June 22, 2018 8:42 AM
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http://forums.aths.org/Uploads/Images/9fe14f96-e925-41db-bbcc-df62.jpg
Modrob
 Posted Friday, June 22, 2018 8:43 AM
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http://forums.aths.org/Uploads/Images/50d1bb3f-be24-4048-ac17-d7e4.jpg
Modrob
 Posted Friday, June 22, 2018 8:44 AM
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http://forums.aths.org/Uploads/Images/9aae6516-820f-400b-9182-a00d.jpg
junkmandan
 Posted Saturday, June 23, 2018 3:36 PM
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So Rob...............What was your cure ?
Modrob
 Posted Sunday, June 24, 2018 2:25 AM
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When I first tested it (with fingers spinning the input collar) the needle would hang up sometimes but would turn loose. Figured it just needed a little cleaning inside. Very simple mechanism really...that bottom "cup" separates from the shaft and its associated "cup"...the insides had a little bit of surface rust that was enough to cause some binding. Clean and smooth and it now moves better. I did tighten one more turn the tiny spring that mounts to the needle too. Figured it might be a little weak after so many years...
junkmandan
 Posted Sunday, June 24, 2018 3:38 PM
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Modrob
 Posted Sunday, June 24, 2018 9:16 PM
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Ahhhh...interesting...😊

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