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Old 03-29-2024, 12:57 PM   #6
68panelman
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Join Date: Jan 2011
Location: Delaware and Long Island, New York
Posts: 3,450
Re: What's this firewall grommet/brown wire for? Where's the tach hole?

My 1970 Blazer has been played with by other owners in the 55 yrs since it was built in Aug '69 hence the additional wires from the speedo plug, (HEI hot lead) You are correct on the Lt Brown wire, here is the location on my truck. As usual a sideways picture 😔
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