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One interesting feature of that safety switch is both backup light function and neutral/park start interlock use the same contacts in the wiper, or movable part of the switch. So, if the contacts in the wiper, or the spring tension in it fails, either backup light or starting can be affected.
The wires in and out of that switch, which is the same 83 or 89 automatic, are blue and blue/yellow for the neutral safety function. In this link http://cleanflametrap.com/neutsw.html there is a picture of the insides, with the fix for a backup light problem explained.
I've heard replacement is not that expensive either. The harness connector is only a foot from the switch under the carpet.
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Art Benstein near Baltimore
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