Does anyone know what thread the Lightning intake air temp sensor is ?

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Well, I'm pretty sure it's a "straight fit" or 3/8-18 NPSF (this is what the print calls for). For pressurized applications, they guideline is to use a tapered fitting in a straight fit hole.

However, the NPT will probably hold up. ;) If you have the NPSF, use it. If not...