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

8000 rpm tach

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Old May 12, 2018 | 09:21 PM
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Default 8000 rpm tach

It there any way to change my tach from a 6 to an 8 grand tach in my 93’ .
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Old May 12, 2018 | 09:33 PM
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Install a ZR1 or LT4 cluster
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Old May 12, 2018 | 09:46 PM
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Originally Posted by Kevova
Install a ZR1 or LT4 cluster
Would that require a different calibration or is that built into the cluster?
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Old May 12, 2018 | 09:55 PM
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Odometer would need programmed
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Old May 12, 2018 | 10:33 PM
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Originally Posted by billschroeder5842
Would that require a different calibration or is that built into the cluster?
It's plug and play, nothing else needed.

Another option - there used to be places who would recalibrate your original tach and put a new overlay on it. No idea if those still exist, or how the price compares to used 8k clusters. Back when I did mine the clusters were still available new and were cheaper than the recalibration.
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Old May 13, 2018 | 02:33 AM
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Originally Posted by Kevova
Odometer would need programmed
Odometer data is in the CCM/BCM....not the cluster.

I believe that there are years of incompatibility; some year ZR-1 don't work with others. WVZR-1 can clarify. He is "the man" for topics like this one.
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Old May 13, 2018 | 07:08 AM
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Many years ago I thought this to be likely the 'direct interchange' for clusters. I've never confirmed the 'telltale' features of the '94 to '95 & '96. I had no interest.

ODOMETER is in the CCM

OP - for a direct swap you need '92 or '93 ZR-1

**************************************** **

1990 ZR-1 - 16133461 (260° engine oil temp)

1991 ZR-1 - 16142481 (280° engine oil temp)

The LCD's are assumed to be the same in these and they should exchange directly to '90 & '91 only cars.

1992 ZR-1 - 16158841

1993 ZR-1 - 16158841

The '92 - '93 base LT1 cars share the same "base cluster" so these numbers are considered directly interchangeable.

1994 ZR-1 - 16168031 ***

1995 ZR-1 - 16168031 ***

1996 LT4 - 16201621 ***

From this information it appears that '94 through '96 could use either of these for a direct exchange since the '95 & '96 base cars shared the same cluster.

***I'm not familiar with the telltale/warning lights on these

People have swapped LCD's year to year etc and mentioned no issues or issues that didn't concern them. I've paid little attention to that. Until a cluster tachometer is confirmed to be correct when compared to a scanner on the ALDL it should be assumed that it likely needs calibrated.

Last edited by WVZR-1; May 13, 2018 at 07:11 AM.
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