you getting no CEL's. Check for continuity on the back of the speedo harness what inputs speed signal and rpm. And check on the engine harness after the vss. If there is none bw the ecu and engine check ur vss and make sure its working (another contin check) and if its present there then the wiring is Fucked but its an easy fix. just a lot of wire tracing.

EDIT: you know just trace the VSS wiring from the EX harness and make sure that it pins in the same location as the dx harness on the main engine harness