Trouble calibrating Auto Meter Speedo

[Higgybulin]

Like the tital says, anyone having issues calibrating the Auto Meter Platinum speedo that come with the kits? This is the 6 gauge package. It is running to a T5 trans(the green/grey wires) plugged into the speed sensor(Standard SC 37). Any help would be appreciated!!
Higgy

[Dgc333]

There is a green wire and a grey wire that connects to the speed sensor. The green wire in the dash harness connects to the input on the speedo and the grey wire needs to be grounded.

[Higgybulin]

This is ringing a bell actually!
Higgy