I think I see what's going on here. It looks like the threads on a 1/8 compression fitting are 5/16-24. That's what I have on the end of my oil pressure gauge line. It's a male compression fitting/nut. So it seems I need an adaptor with 1/8 NPT male on one end, and a 1/8 female compression on the other, which would be 5/16-24. I'll see if that exists. Or find a new compression fitting with male 1/8 NPT on one end. If not, I'll buy a new kit.
Last edited by RBs36; 01/05/2026 6:42 PM.
