There was an OEM one but the parts were euro only, and are now NLA.

The OEM setup used the hood alarm switch to turn on the light. If I were installing an underhood likght I would try to grab one with a built in tilt switch, like one from a 90s Ford. They work great and then you just feed it fused constant power.

-J

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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket

Tesla Model 3. 205,000 miles. Been to 48 states!
Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels.
2014 Cadillac ELR
2013 Fiat 500E.