Huzzah! Had to make some assumptions, but I think I have something usable (of course, I’ll have to re-do some of this when I switch sensors, but I know how to get there now (mostly)).
The company I work at has these crazy huge plungers - as in they look like you’re about to shoot up a gorilla sized (I’m sure they come in larger sizes). I have another that has a “needle” that I use to put lithium grease in awkward or small places. Anyway, the tip of it without a needle fits almost perfectly into the end of the sensor without going in too far. With it spitting out raw values, I pulled on the plunger - which could have damaged the sensor, but there’s odds it’d have gotten scrapped anyway. I got it to go as low as I could and decided to call that zero PSI (~155 analog read) which is roughly 0.1239 V. Shifting the expected range (@3.3v) to a max of 2.7649 V which should read at ~3431 (using the other post that has now disappeared from my tabs - there’s 1241 ‘steps’ per volt). Some mapping and rounding and viola, 14 PSI sitting in the open.
I suspect this is a little low as my (admittedly hacked together) weather station says its ~1016.1 hPA which is about 14.7 PSI. Good enough for now and I’m hungry 