| Not NPT. British Standard Pipe Tapered (BSPT) is a different thread from the NPT on the sensor from Summit. You either need to get an adaptor, or better yet splice a cast link with a NPT fitting into the upper radiator hose. Z-1 sells them. Wrenching down a National Pipe Thread (NPT) into a BSPT pipe hole you risk cracking open the casting. FYI There are: National Pipe Tapered.
British Standard Pipe.
British Standard Pipe Tapered.
Army-Navy (AN) which is MIL Spec All just different standards. The *PT fittings just have a threaded end, which is what seals. The AN fittings have a 37 degree conical end which is what makes the seal. EDIT: If you see a hole, its a female end, if you see the outsides of the threads, its a male end. BPST and NPT are very similar, but they differ in two ways, the angle the threads are cut in are off by 5 degrees, also BPST has rounded thread peaks, while NPT has flat peaks. The O.D. and thread pitch are the same tho. More on pipe threads here: Different Pipe Threads
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