Reminds me of the guy interviewing for a mechanical position. We had so many applicants that were clearly ill prepared or lacking the necessary skills we started asking silly questions. Like pulling a 6" scale out of pocket and asking, “How many thousandths are in an inch?” No lie, one guys says, “I don’t know but there must be a million of them”. That has lived on in infamy since…
For reference, the FMVSS standard allows for as much as 25% under inflation activation threshold. So the tire pressure can drop as much as 25% below the recommended inflation pressure before the TPMS alerts the operator of a low pressure tire. Puts some context around the criticality of the pressure setting… I have a very accurate 3" 60 PSI dial gauge with 1 PSI scale markings. If I’m within -0 +2 PSI, good enough for me.
That’s my point. If I’m within +2PSI on the gauge, I consider that good enough. Even though the gauge has a pressure relief valve and I could set it exactly, I’m not that concerned, frankly. FWIW- the gauge was a gift from a friend in the gauge industry and is way overkill. NIST traceable and I have verified it at work a few times for kicks. We send most of our equipment there out for calibration. It has a very robust shock cover and the guy bragged it would never go out of cal. So far, I have not been able to refute that claim in more than 20 years…
I have not the concern you guys do. if the tpms goes off I plug in the portable compressor and trust its gauge. TPMS gives me pressure to a pound. You guys are a rare breed to be so obsessed with tire pressure, probably 5% of the driving public!
Most vehicle owners neglect their tire pressure maintenance, the warning light is off, but the tire pressure is 3 to 5 psi low. Tire wear is noticeably greater on vehicles that operate just 5 psi low.
Some years ago, the state of California began requiring all auto service providers to check and inflate the tires on each vehicle checked in for any type of service. This program is in the interest of reducing fuel consumption and pollution. Car needs a light bulb, inflate the tires, car needs a wiper blade, inflate the tires. Millions of people have no interest in their vehicles tire pressure unless one tire is totally deflated.
Yeah, this one has a short brass stub with a swiveling connection and a pressure relief valve. Makes it easy to fit onto any stem even though it has a relatively huge gauge diameter. I wouldn’t like a long hose attachment, this one is very portable and has a nice small zippered pouch as well. I actually have two but the first one does not have the swivel so it is far less useful. The reading does not drop at all when removed from the stem so you can take a measurement and then relieve the gauge pressure afterward.
He had this made for me as a gift along with a bunch of Cejn air hose couplings and quick disconnects. I cherish both of those gifts and the fact I have not had one issue in more than 20 years says a lot.