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06 Tach w/ a mind of its own?

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My 06 tach is all over the place. It started out as a bad instrument cluster which a dealer replaced under warranty while i was out of town at the inlaws. It first was every gauge would cut in and out as if it was a loose connection.



Now just the tach is jumping all over the place. During normal acceleration it will hover around 3-400 rpm's then once the actual RPM's get somewhere near 2K it the tach will jump way up to 3-4K. A couple times it wrapped all the way around to the bottom of the peg.



Every once and a while it will work normally. FWIW the ECM is seeing the real RPM's because when i use the edge A2 through the OBD2 port it reads normally.



I hate to go back to the dealer because every time i go in there something gets screwed up. Ive checked grounds and all seems well. I dont have any after market stereo stuff and it does the same thing w or w/out the edge plugged in.



Any body see this b4 or have any info?
 
Im having the same problem with mine. My Attitude shows the correct rpm but the gage is about 500 off most of the time, every once and a while it reads correct but 99% of the time its off. Been like that for a couple of months now
 
Basilry, on a side note have you dynoned your set up, i have a similar set up and am about to install a set of DDP 90's soon.
 
Since there are more than one "crank/cam" position sensors, could one be failing while your readings are coming from the other??

I'm pretty sure the crank and cam position sensors provide the signal to the ECM for the tach.
 
could be..... i would think that the ecm gets the rpm and tells the tach to display what it sees. I suspect the cluster but was thinking it could be some kind of ground problem. Ive double checked all the under hood grounds and they seem to be in order.
 
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