Diablo Sport and Gears for a '98 cobra

Hey guys, been reading up on some gears and have decided that i'm not going to fear the gear and hit up some 4.10's. Now my question is how am i going to re-calculate my speedo. I have a Diablo Sport hand held tuner but i'm not sure if it is able to adjust a '98 cobra's speedo. If i'm not able to tweek it with that what should i do?

any help is greatly appreciated!!!! thanks guys :nice:
 
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