This is the fitting you need to adapt the oil pressure sender over to add a gauge, these seem to be very high quality steel, much better then any others i've seen,they are also listed as high pressure for hydraulics, so they will be fine in the oil system. these are from Mcmaster-carr part number 4936K408, the fitting i'm talking about is the steel part, the blue part are the AN adaptors , you need this because the threads in the oil filter adaptor,as well as lots of other honda thread are Brittish standard pipe thread, your gauge adaptors used
over here are 1/8 npt, the engine uses 1/8 bsp , you can try to screw one in and force it ,but you will end up damaging the soft aluminum, there is a one thread per inch difference, they look exactly the same but they aren't. this one thread per inch difference is just enough to damage your threads. Some people will say just force it in there, but those of us who want it done correctly will use the adaptor. someone sticky this please and lets end the debate on the proper fittings.
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