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i have a 2003 f350 6.0l desial 60,000miles auto 4x4.
the speedo will jump around from 0 to pined even in park and while driving. tack stays constant and true. this problem will come and go when acting up truck will fell like it shuts off and restarts:dunno:

any help thanks
 

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I have a buddy with a 2005 f-250 6.0l 70,000miles auto 4x4 and his speedo will act like that but it dosent hurt the performance. hopefully someone can answer this thread with some knowledge and help you out.
 

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My 2006 f350 6.0l diesel, acted up the same way at around 20,000k.

Speedometer pegged. Next time out,all works fine. Next time out speedometer wont drop below 25mph. Next time speedometer fine, but tach is pegged. Next time both gauges acting up.

Dealership replaced instrument cluster, under warranty.

Worked fine for 3000k. then....

After TOPPING fuel tank, SES light comes on after 75 miles.
Dealership says code is bad fuel gauge. Replace instrument cluster...again.

So far, so good, except now it takes about 130 miles for the fuel needle to drop after TOPPING the tank off.
 
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