Poor mans electronic speedo conversion

supwicha

Veteran Member
Feb 23, 2014
185
Victorville, CA
Hello all, looking for some suggestions/feedback on my cluster project. I have recently converted my '79 to a later model EFI LT1 setup from a Caprice. In an effort to control cost, I did not want to change tailshaft housing to have a VSS signal at $500. I also wanted to maintain the stock cluster appearance. I gutted the sppedometer head and updated it with components from an '05 Chevy Aveo and will use the original PCB wired to the PCM. I should be able to update the decal for a perfect match although it is surprisingly a close match. I should also be able to update the calibration via the PCM. Has anyone ever tried this type of conversion before? If so, how did it work out for you? So far I'm into it for $18.

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supwicha

Veteran Member
Feb 23, 2014
185
Victorville, CA
I do not have it installed yet. I still have about 25 hours more of work to complete my LT1 conversion. As well as some other miscellaneous items. I figure I'm 6-8 weeks out before I resume the cluster project. I'll update when I get there, thanks for your interest.
 

supwicha

Veteran Member
Feb 23, 2014
185
Victorville, CA
hogg said:
Can't you just move the hand?

Most likely he is describing an issue related to accuracy over a various range of speed and not a needle being stuck at a certain position. Electric speedometers normally self center at zero at startup. It may be that the pcm needs the correct tire/gearing combination to work.
 




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