i've noticed all of my 60V6 ones seem to be a fairly linear 0-90 ohm for their 0-80PSI range... they read accurately enough to notice the trend of when the oil needs changed(I would lose ~5PSI off of 30ish at full temp highway speeds). change the oil and do the same run, pressure goes back up to where I expect it to be. I guess that's handy without a trip computer or memory issues to keep track of oil changes.

beyond that..... I expect to see it show where the oil pressure relief valve is set at(60PSI) when cold, where the lifters start getting unhappy(around/under 10ish) and pretty much anything in-between is not too relevant.

I wonder how well the newer ones that keep track of oil pressure for better VVT/VCP control are?