I think the only ones to have 100 mph speedo's were some years in the 70's. You could either pull one out of a truck with that vintage, or you could check ##### Truck [www.lmctruck.com], I don't think that Chevy Duty carries a 100 mph version (but I could be wrong). If you are looking for something higher than 100 then your best bet would probably be to see what Summit has to ofer in their catalog.
