Thanks for the input I went ahead and got the pcm tuned and they were able to fix it
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Jeff is correct, no longer do you need to swap in the correct speedo gear in the transmissions. They all have the same speedo, it's what the ecm is program
This 1968 Pontiac GTO was driven daily from the day the John and Judy Romano got the car, December 20, 1967, until March 1992!
Honestly it's for looks more then function, just like on the Trans Am. I read you'd have to be over speeds of 100 constantly for both to provide any
I'll keep that in mind for the next set of upgrades! :-)