Dear Mike: The tapered end of the tube will need to be trimmed off. The end of the tube needs to have a consistant diameter. The following explanation is reality. The new ferrule is different than the deformed one you now have. It will be tapered in both directions (as your old one is tapered in only one (toward your palm in the photo). The ferrule you will purchase will slip on the tube (over the end, and down farther (about one eighth inch of the now not pinched tube will stick out). As the assembly is tightened, the ferrul is deformed on its ends and correctly pinches the tube (actually deforming the tube to a tiny bit as it is pinched). The pinching of the new ferrule locks it onto the tube providing two places of metal to metal seal at each end of the ferrule. The brass fittings also seal as they have internal tapers which are deforming the ferrule. One such taper is in the left compression nut, the other taper is in the fitting it screws into. No sealing material or tape should be used on the compression part of this system. Tape can be used on the fitting screwed onto the meter, and where the compression fitting screws into that coupling.
The ferrule you have and the reason the line was pinched down is because the line was not inserted far enough into the ferrule when it was tightened. This allowed the ferrule to pinch the end of the tube , instead of along its diameter. The end collapsed, and allowed the tube to "squirt" backward out of the fitting. Thus when assembled, the tube pulls out.
I am concerned that your engine has good oil pressure. Check that gauge with a known pressure source to assuer you (and us)that it works. Then assemble as above, it will tighten down correctly, and not come out. It can be ptighened pretty tight, just make sure the tube is pushed in as far as it will go as you tighten it. If it should leak, tighten it a bit more. The ferrule will not be able to be removed from this point on, without cutting off another piece of the tube. It is a single use fitting, that can be removed and replaced, but not the ferrule, or the nut, which will be locked on the line. Keep in touch, Jim
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