Well I really don't know what to say, but I would think the Ford parts are the best. However the Auto Zone parts are most likey Ford parts that have been refurbished.
I just took the old electronics off and installed them in the new meter, I did use a small dab of dielectric grease in the connector, never hurts.
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[b]12.16 @ 113.5, 1.78 60ft..no traction in the 90 degree