C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Gauge cluster bezel differences

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Old May 3, 2017 | 07:32 AM
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Default Gauge cluster bezel differences

Anyone know what the difference is (other than the part numbers) between a speedo cluster bezel on a '84-'85 part# 14047529 and one for a '87 #14078656 ?
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Old May 3, 2017 | 08:11 AM
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Originally Posted by TimV SR
Anyone know what the difference is (other than the part numbers) between a speedo cluster bezel on a '84-'85 part# 14047529 and one for a '87 #14078656 ?
i'm thinking that in 86, they changed the angle of the instrument cluster to reduce glare. that design continued thru to 89.
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Old May 3, 2017 | 08:15 AM
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I think that function and fitment is identical.

Early clusters have a different look in the center window, and a more pointy RPM gauge.




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Old May 3, 2017 | 09:35 AM
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I think that function and fitment is identical.
not quite true. from the black book -

(1985)
Electronic instrumentation continued much as the previous year, but displays were revised and improved with cleaner graphics, less color on the speedometer and tachometer, and larger digits for the center-cluster liquid crystal displays.
(1986)
The angle of the 1986 digital instrument display was changed to improve daytime viewing by reducing glare.
by changing the angle of the IP "mounting" a different bezel was required.

note the angle of the speedometer to the bezel (86-89) vs. the 84-85 instruments to bezel -






Last edited by Joe C; May 3, 2017 at 01:01 PM.
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Old May 3, 2017 | 09:50 AM
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Originally Posted by Joe C
not quite true. from the black book -

(1986)

(1986)

by changing the angle of the IP "mounting" a different bezel was required.

note the angle of the speedometer to the bezel (86-89) vs. the 84-85 instruments to bezel -





Thanks Joe. That tells the story. I've probably looked at hundreds of C4's over the years and never noticed this difference.
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Old May 3, 2017 | 11:03 AM
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So with the matching plastic cover both will work in any car? Anyway, I thing that the early one looks better.
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Old May 3, 2017 | 11:53 AM
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Originally Posted by JoBy
So with the matching plastic cover both will work in any car? Anyway, I thing that the early one looks better.
not sure what you mean. the dashboard substructure is different between the 84-85 and the 86-89 cars. that substructure defines the angle of the instrument cluster. only 84-85 bezels work with 84-85 cars and 86-89 cars and bezels work together.

from what I understand, 84 IP are unique and one year only. 85's are also one year only. not 100% sure, but 86 thru 88 are interchangeable, and 1989 had different internal PC boards and may be unique.

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Old May 3, 2017 | 11:08 PM
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My dash frame was cracked in several different places. I walked through J&D's yard and picked one out from another car. They removed it for me and I swapped it out with mine. Didn't pay attention to the year of the donor car and had to buy the 84-85 bezel. My 88 bezel wouldn't fit. I kind of like the flat bezel better.
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Old May 4, 2017 | 05:22 AM
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Originally Posted by Corvette40
My dash frame was cracked in several different places. I walked through J&D's yard and picked one out from another car. They removed it for me and I swapped it out with mine. Didn't pay attention to the year of the donor car and had to buy the 84-85 bezel. My 88 bezel wouldn't fit. I kind of like the flat bezel better.
If you have all the parts and it's only cracks you're dealing with, check out http://www.plastex.net/Product_Info.php
I've fixed some cracks and made some missing tabs on mine successfully. Take a look, may be of use to you.
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