recalibrating 85mph speedo

[mexlife]

Hello,

I have an 81 280zx n/a with the pointless 85mph speedo. I got a white face for it that goes to 200mph, and i was wondering if it's possible to recalibrate the speedometer to function with that face.
I heard that you can take the 85mph speedo to a shop to recalibrate to work with a 130mph face plate, but I was wondering if it could work with the 200mph one.

Thanks in advance...

Luis

[Ivan]

defiantly possible, don't know where to suggest to go to though?