NP205 Leak and Speedo Recalibration

[AHowe88]

Well it appears I am leaking where my speedo connects to the Tcase. I found this little write up, on how to fix it: http://coloradok5.com/forums/showthread.php?t=269149

Seems pretty self explanatory, but I'd like to take this opportunity to recalibrate my speedo, with the calibration box pictured in the above link.

I found one here (search for: #54RA2)
http://www.transmissioncenter.net/sp...n_______va.htm

A few questions:
- When I take this apart, do I need a catch pan, or should there be no oil?
- Does anyone have any experience with the speedo calibration box, good or bad?
- Where else should I check for leaks? I'm nervous this isn't the only leaky spot...