after installing the white face guages that say 150mph,from the factory 110mph how do i get the speedo to read the correct mph?thanks for the input yall have given me,do i need to use the hyper tech programmer,i usally order from summit or jegs are the bbk gauges any count,and do they come with good install directions?the point being i hate having 110mph speedo in my z and i want to change them to the way they should be!

 

I think there was a thread about this not too long ago. I don't think you can slap a 150 overlay on the lower top speed cluster and make it work like it is a 150. I am not sure so you might want to do a search.

 

you need to switch the whole cluster out with a 150 mph one then you can put the white faces on there.