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

84 Tach Problems

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Old Nov 7, 2016 | 06:43 PM
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rorrapalooza's Avatar
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Default 84 Tach Problems

A few years ago, the dash stopped working (except weirdly it would blink when the right turn signal was on) and eventually it was sent off to batee.com where it was fixed for the most part

since I reinstalled it, the tach hasn't worked correctly; its fine till the motor gets up to around 4000 RPM, then as I continue to accelerate it drops from around 4000 to around 0 over a second or so and then starts climbing back up seemingly as if once it hits 4000 rpm the value displayed on the tach is the current rpm - 4000.

The hockey stick and number readout agree on what the rpm is

Any idea what the problem is? Ecm sending the wrong signal?

Last edited by rorrapalooza; Nov 7, 2016 at 06:49 PM.
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Old Nov 8, 2016 | 12:34 AM
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I suspect that you already know the answer to your question: batee.com

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Old Nov 8, 2016 | 11:42 AM
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I know, im just holding out hope that i wont have to dig the gauges out of the dash again
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Old Nov 8, 2016 | 02:35 PM
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Call Bryan. He may be able to give you some tips. He's a good man!

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