I have had similar symptoms (temp gauge needle flickering) caused by bad negative battery cables on 2 84 diesels. The cables were corriding inside the terminals and jacket. Others have reported similar symptoms due to loose or rusty ground point behind the instrument cluster.

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Palangi

2004 C240 Wagon 203.261 Baby Benz
2008 ML320 CDI Highway Cruiser
2006 Toyota Prius, Saving the Planet @ 48 mpg
2000 F-150, Destroying the Planet @ 20 mpg



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