Plunger-type switch under the hood?

markup97

Registered
Ok guys; what is the plunger-type switch looking thing (passenger side front underhood close to the air box) under the hood and what does it do? I see it is a two-wire and is connected/routed in with the MAF wiring. It looks like it could be an underhood service light switch, except there is no underhood service light on the MKVIIIs.
 
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