??? There is no place in that photo for a sensor. The hole, I guess you figured out, is for mounting a bracket. OP? How about a photo looking down on the ENTIRE front of the intake?
In your previous photo, it almost looks like there's a tapping on the other side......but I can't see in the photo...........
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Just for info, 1/8 US pipe is close to but not the same as 3/8 SAE fine bolt thread.