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

1985 Digital Speedometer

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Old Jun 6, 2018 | 07:37 PM
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Default 1985 Digital Speedometer

If anyone can give me a clue, I'd appreciate it. My speedometer worked perfectly until I pulled my valve covers to replace the gaskets. After I got it back together, I took it for a drive and the speedometer still lights up, but just stays on zero no matter how fast I go. Obviously I must have knocked something loose, but for the life of me I don't know what it could be. Any help is appreciated.
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Old Jun 7, 2018 | 10:43 AM
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double check the "TACH" connection on the side of the distributor. beside a distributor harness, there should be two single wires, one, pink, for +12V ignition, and a white wire for the tach. also, follow that white wire down to the tack filter which is bolted to the aft side of the LH cylinder head, and double check all connections. since you said you've replaced the VC gaskets, something may have been disconnected in the process.

edit: NOT SURE WHY I WAS THINKING "TACH" - ??? have to blame it on old age, or some parallel universe thing -

Last edited by Joe C; Jun 8, 2018 at 09:02 AM.
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Old Jun 7, 2018 | 04:11 PM
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there's a sensor in the side of the tranny...driver's side...two wires come out of it and run up....if either is broken....no speedo...just my 2cents...happened to me......
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Old Jun 7, 2018 | 08:23 PM
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ok guys, thanks. I'll look into this over the weekend if the weather holds. Thanks for all your help.
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Old Jun 8, 2018 | 08:18 AM
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Interesting thread!!

OP - was your thread title a TYPO?

'Joe C' seemed to think so and his thoughts certainly would apply if you meant tachometer.

If it actually isn't then you start 'under-car' where 'playsdixie' mentions and you should certainly have a CEL (Check Engine Light).

Last edited by WVZR-1; Jun 8, 2018 at 08:30 AM.
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Old Jun 8, 2018 | 08:47 AM
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Originally Posted by WVZR-1
Interesting thread!!

OP - was your thread title a TYPO?

'Joe C' seemed to think so and his thoughts certainly would apply if you meant tachometer.

If it actually isn't then you start 'under-car' where 'playsdixie' mentions and you should certainly have a CEL (Check Engine Light).
damn - don't see where the OP edited his thread. could have sworn I read "tach." oh well, not the first time I screwed up, and certainly not the last -
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Old Jun 8, 2018 | 12:56 PM
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Originally Posted by WVZR-1
Interesting thread!!

OP - was your thread title a TYPO?

'Joe C' seemed to think so and his thoughts certainly would apply if you meant tachometer.

If it actually isn't then you start 'under-car' where 'playsdixie' mentions and you should certainly have a CEL (Check Engine Light).
when my vss wires were cut....I didn't get a CEL...but I did get the code for vss.......
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Old Jun 8, 2018 | 02:06 PM
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Here is some info I think a wire must of came loose.


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