TCI supplies a custom plate, it's red anodized.
The lack of pressure is your problem, on the test port for a particular gear, it should be the same as line pressure (i.e. well over 200psi) when that gear is selected.
You saying that you used your original separator plate?
The kit contents http://www.tciauto.com/instructions/376015_inst.htm
states "1 Separator Plate"