Erratic Tach - Ford Powerstroke Diesel Forum
 
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post #1 of 9 Old 12-03-2013, 06:12 PM Thread Starter
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Question Erratic Tach

Tach started being erratic with needle not making sense.

I discovered by accident that with the lights on I can move
the dash lights dimmer switch and mover the tach needle!

I essence I can move the tach needle up and down by rotating
the dash dimmer dial.

Any ideas???

Thanks

2000 F350 Automatic 7.3L
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post #2 of 9 Old 12-04-2013, 09:37 AM
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Sounds like short in or around the gauge cluster. Did you have anyy work done recently. Might have to check the wires in it.

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post #3 of 9 Old 12-04-2013, 04:14 PM Thread Starter
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No work done,,,,,,,,,,


Hoping someone has had that issue with a magic fix

Last edited by Sundance58301; 12-04-2013 at 04:35 PM.
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post #4 of 9 Old 12-04-2013, 04:36 PM Thread Starter
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i get the short idea and would agree, but the correlation
with the dash dimmer dial is weird.
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post #5 of 9 Old 12-05-2013, 06:29 AM
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Could be in the cluster itself. All I could say is test it with a junkyard cluster. If it still does it you know its further bacck.

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post #6 of 9 Old 12-06-2013, 11:38 AM
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Mine did the same at some point. It turned out to be a leaky windshield that had eventualy corroded the actual cluster causing all kinds of weird things. A new cluster fixed the problem. Got one with a 100,000 less miles on it to boot...

I used to think high mileage was a bad thing, but its a badge of honor on my F250 Powerstroke.
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post #7 of 9 Old 12-20-2013, 10:53 AM Thread Starter
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So how hard is it to switch out cluster??
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post #8 of 9 Old 12-20-2013, 11:23 AM
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Once you learn how to pop the dash off and getting the cluster in your hands it aint to bad...

I used to think high mileage was a bad thing, but its a badge of honor on my F250 Powerstroke.
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post #9 of 9 Old 12-21-2013, 12:37 AM
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dash is really simple. pop out the headlight switch, pull at the seam on the dash above the steering wheel, unplug the radio and cig light, under cluster and replace and repeat in opposite order to reinstall. just had to do this to replace the turn signal switch.

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