Re: 1997 GSX - DD, RR, and 11's.
The stock threads are BSP which is a very unusual size, so I would guess the first one is a BSP to NPT adapter, then a T-fitting from there for the gauge and turbo feed.
It's a little scary having your oil lines completely exposed on the bottom of the car like that. They look low, but I guess it's probably still above the oil pan.
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