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Message: <blockquote data-quote="glittle75" data-source="post: 599402" data-attributes="member: 8675">3/8-18 NPSF with Pipe Thread, and no you don t have to Need to have anything welded. if you look at the PI intake crossover, you can see where the place is for the second sensor, theres allready a "boss" on it to drill into and tap. its pretty much in the opposite place of the one thats allready there on the intake. but some people just have a bung welded on the top of the T-stat housing and put it there. but those are mostly the guys that didnt get a Aluminum crossover PI intake, since the T-stat housing is metal regardless of intake material.</blockquote>