New oil pressure switch doesn’t fit...318 LA
I found a 1/8” female 1/8” male NPT adapter, and it threads into the block *pretty* good. Still not perfect, so I used some Permatex Seal + Lock thread compound. Let’s see how it does. The only bummer is that it has a 72 hour cure time. Installed it late yesterday afternoon and it doesn’t seem to have set up at all yet.
There does seem to be a tiny pinhole where the adapter seats, I’ll close that up just to be safe.