I can't prove that it works yet, I still havn't even put the box in my car
i'm 100% sure it will work though. Here is the link for everyone.
Speedometer Gear, Speedometer Gears, Ford, GM, Dodge 700R4
This is the item I got, its a ford part, but it should do the trick, I havn't even had a chance to match this up to the gearbox yet as my T5 is at my friends workshop and my car is off the road due to it catching fire.
If you buy it, and later we discover its no good, I wont be held accountable for your loss.
#9SS. Ford 8 pulse speed sensor for the above driven speedometer gears. This speed sensor works with cable only, pulse generator only or both cable and pulse generator at the same time. Works with speedometer cable number 4190. Cost $39.00
I'll let you know if it works, you may also need to have your memcal tuned again, there is an option for what type of VSS to use.