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this is my first time trying to send a message to this form so I hope I'm getting it correct. Regardless I seen your write-up on the zf6 swap and I think it's an excellent write-up. Even down to the point of a few beers and some bad words. When I did my swap I may have used the whole Encyclopedia of bad words. LOL! Regardless the only thing that I did not see was the speedometer. I have already done everything else but have not come to the speedometer yet because I could not get a straight answer from anywhere. I also have been doing some other major things to my C4 so speedometer hasn't been at the top of my list yet but it is coming to that. My 91 originally came with the 4L60E, and the plugs are different. I know that the speedometer needs the OEM computer so I'm keeping that to handle all the things the computer needed to handle even though my engine is powered by an after-market standalone EFI. If you have any information regarding how you overcame or attached the speedometer it would be greatly appreciated.
