I have 98 S-10 ZQ8 that is an auto w/o tach cluster. Well I found a 98 2.2 auto with tach on ebay. So I bought it and well of course the mileage is different. How do I reconcil the mileage between the two, its about a 50k more miles than mine has on it. How much does it cost to have done at a dealer and are they willing to do it? Or is thee something I could do to do that. I do have and ODB-II reader for my laptop. I plan on keeping the truck forever so getting it fixed isn't a concern, it would just be nice to have it correct.