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I made a simple circuit that measures the voltage off the TPS in parallel with the EEC and use that to create variable pulses. With more throttle, this circuit simulates more speed. Feeding this to the EEC, there was no difference in performance whatsoever. Idle, slow, fast, didn't matter.
You wouldn't by chance still have the schematic diagram for the circuit you made would you? This may be the solution to one of my compatibility issues with the cluster swap I am doing.