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After I change the rear end the speedo reads incorrectly. 70mph is aprox 60mpg and so forth. Is their a kit or any way to fix that?
 

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OPEL-LESS!!!
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you need a gear reducer. they are normally a little box that threads onto the tailshaft where the speedo should go, and then the speedo cable threads into the gear reducer. i have one by VDO on my car, and its reading accurate.
 

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For the Opels do you really need a gear reducer?

I had the same problem with my Challenger when I switched tire sizes. I simply ordered a new speedo gear ($9) with the correct number and size of teeth and swapped it where the spedo cable goes into the tranny. Couldn't you do the same on an Opel?
 

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Any good speedo shop should be able to help you out. Check the Yellow Pages and give them a call. HTH.

Ron
 
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