I doubt the engine side wiring harness would effect the starting test of the light as the test function did not use the sensor unit on the engine as a ground during the test. Did you replace ONLY the engine side? Does the light work otherwise? Is the sensor on the 65 car a single terminal (only works when hot) or a two terminal (works when too hot or still cold). You can test the circuit by grounding the wire(s) at the sensor to see it the light(s) works then. But you may still have problems under the dash.
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