Gears & Axles - getting computer calibrated for gears

I have a 98 camaro ls1, and it has 373 gears in it and needs the speedo calibrated, what are my options on getting it calibrated?

I have a auto too*

buy a handheld tuner or take it to someone/someplace that has the laptop/software/programming to do it.

I just installed 3:73 and sent my pcm to Frost.Sent it out on Monday and received it back Saturday.Could not be happier.Major improvememt.

How much was It?

go to his website,tunedbyfrost.com