Speedo issue

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I am now the proud owner of a ST183C, a 1992 factory convertible.

However, I have a minor issue, the speedometer is out (under) by around 20kph; I have purchased a corrector module & know how to connect it, I just can't seem to find where to connect it, as in, which wire on the instrument cluster connector?

I have searched google with no results; I also downloaded a service manual but, it's for American/Canadian models so, the wiring is different.

Any help will be greatly appreciated...

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I am not sure what is a corrector module but the speedometer cable for the 5th gen celica connects to the back of the instrument cluster at the center position. As you can see in the picture, it connects to the green round connection. 


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Thanks for chiming in but, I didn't mention, my car is a JDM model with an electronic speedo... as opposed to the Aus model with the old school drive cable...


After much running (well, calling) around, I did find out which is the speedo wire but, it's irrelevant because the corrector module doesn't work on Toyotas...

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