Sorry to waste the bandwidth, but...
> Sea level pressure IS assumed as the "0" reading on every pressure
> guage designed for automotive use.
Only uncalibrated ones.  Gauge pressure is gauge pressure, and is
referenced only to *local station pressure*, not sea level.  That's why
gauges have a zero adjustment (unless they're cheap junk gauges).  The
station pressure in Denver is about 11 psia, so a gauge calibrated at
sea level will be off by roughly 25% unless re-zeroed, and vice-versa.
Thus, "sea-level" is irrelevant for gauge pressure measurements.
> As an example of my meaning; a new tire, once mounted on its wheel
> rim, before ever having any air pressure added to inflate it to spec,
> contains ambient air pressure of the atmosphere around you.  This
> would be measurable as 14.5 to 14.7 PSI (close enough, as most
> automotive guages won't even read this finely) at sea level. Any
> pressure guage reading must assume to be a value above standard
> ambient sea level atmospheric pressure, or 1 bar.  Read the following
> quote from the wiki link to help you understand what I'm referring to;
Mike, I've spent 15 years running a metrology lab, and calibrated
thousands of gauge and absolute pressure gauges/transducers/manometers.
I hardly need a Wiki explanation.  And a tire gauge hardly even
qualifies as a gauge as commonly used.

When someone makes a real request for info about sender/gauge
compatibility, and you want to make some snarky response, you really
ought to at least make sure you're right. To quote; "what's so hard
about that?"

Keith Hughes
'86 Westy Tiico (Marvin)