Finally found where to buy a 150 speedo replacment for my factory 115 mph guage.
http://www.tacreationsusa.com/gauge_clusters.htm
only $100 bucks for my 95 Z-28
only bad thing is this is a used cluster and doesnt keep your existing milleage ( i assume)?
or you can get yours, rebuilt for $150 to $250 speedometer pluss or something, i dont care about that tho, i just want to see my cars correct speed, once i hpp 3 it to remove the limiter