im one of the lucky few out there with a camaro that has a 115 mph speedo... my question is can i just put in 150 or 200 guage overlays and everything will be fine or do i need to have my speedo recalibrated?

 

I'd say you would have to have it recalibrated. Maybe a mail order computer tuner could do it. I would also have the top speed limiter removed so you can utilize that speedo

 

From the researched Ive done using the search you can NOT just throw a overlay on top of a 115 to make it a 120 or 200. If you want 150 you must buy a 150 cluster. If you want 200 you must buy a 150 cluster, must be 97 and above I think then have it sent to Granetelli or whoever does it for them for that outrages price.