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Wire Harness
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acardon
Bel Air


Joined: 12 Jul 2005
Posts: 273
Location: Southlake, Tx.
PostPosted: Tue Oct 12, 2010 7:03 pm    Post subject: Reply with quote
Alan, that sounds like the tach is not grounded. It could be getting a ground through the bulb in the tach until the dash lights are turned on, then the ground goes away when voltage is applied to the bulb.
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57boxman
Bel Air


Joined: 13 Jun 2005
Posts: 714
Location: The Colony, Texas
PostPosted: Wed Oct 13, 2010 6:59 pm    Post subject: Reply with quote
I'll check that. Thanks
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