New transgo won’t shift

The OP say's "New Transgo" but which kit?
The TF2 kit is not made to wire the throttle pressure all the way back, and if it is a TF2 kit this is probably why it won't shift.

This could be verified by tying half way back and see if it shifts.
With a TF2 kit and the lever tied all the way back it wouldn't shift until real high in the RPM's.