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Is this normal for a 98?

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Old Sep 1, 2014 | 03:07 PM
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Default Is this normal for a 98?

Any ideas/thoughts? When I move the ignition switch to the "on" position, the tach. and speedometer peg out and then return to to zero. I thought that I read an article stating that the LMC5 fixes this but I'm not sure. I do have anLMC5 unit on it's way.
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Old Sep 1, 2014 | 03:24 PM
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That is normal for all C-5s, it is part of the initial computer checks.
All 'analog" gauges do a sweep when the ignition is turned to on.
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Old Sep 1, 2014 | 04:02 PM
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Originally Posted by Phanni
That is normal for all C-5s, it is part of the initial computer checks.
All 'analog" gauges do a sweep when the ignition is turned to on.
"Thanks" for the for the info. For some odd reason I thought the same.
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Old Sep 1, 2014 | 04:16 PM
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And the DIC sweeps one way and then the other spelling out "Corvette...by Chevrolet." I LOVE it. (In case I forget that I climbed into the 'vette instead of the Avalon.)

Gunny John
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Old Sep 1, 2014 | 04:24 PM
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Fact is most folks let it sweep before they start the car.
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Old Sep 1, 2014 | 09:29 PM
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What you are describing is completely normal.
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Old Sep 1, 2014 | 10:55 PM
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I just installed the LMC5 on my 98 and gauges sweep as they should
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Old Sep 1, 2014 | 11:29 PM
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What is a LMC5?
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Old Sep 2, 2014 | 12:39 AM
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Originally Posted by PeteZ06
What is a LMC5?
Here is a link that can explain it better than me. Also tons of posts on this subject if you do a search:

http://www.complianceparts.com/lmc5whoneeds1.html
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Old Sep 2, 2014 | 08:05 AM
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"Thanks" to all of you for the info. As this is my first, and probably the only Vette I will probably own, I value your knowledge.
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Old Sep 2, 2014 | 08:26 AM
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Originally Posted by Phanni
All 'analog" gauges do a sweep when the ignition is turned to on.
Actually no, not all analog gauges do a sweep on startup. This was a feature that was added to the C5 during its design. Having pure analog gauges was important to the C5 designers and the sweeping feature was added as an enhancement along with UV black lighting and floating gauge appearance at night.

Interesting tidbit: Most airplanes have analog gauges that sweep. This helps ensure that the gauges work throughout their range and are not sticking. I guess it's extremely important to know this prior to take off. Not so much with a car, but it is a cool feature.
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