Ford is notorious for having bad grounds which would cause your symptoms. Check the dash harness ground which should be on the main harness as it comes up from the steering column. It is better to check the ground circuit which can be done with a test light, just instead of grounding test light as usual use the grounding clip on a positive wire and touch tip of test light to ground, light on you have a good ground, no or dim light check ground attachment bolts or wire.
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