[Shop-talk] Tire Gauges

[Bob Spidell]

I can name at least one place off the top-of-my-head that can calibrate 
torque wrenches, but not one that I know of that can calibrate pressure 
gauges (I do think some laboratories can do it).

I have several analog gauges that don't agree (one is adjustable). I 
have 3 Accutire digital gauges that all agree with each other and my 
Mustang's TPMS; at least I have repeatability. I set tire pressure 
according to how the tires wear.


On 4/26/2024 10:26 AM, alfuller194 at gmail.com wrote:
>
> Sorry for the late reply – I have no idea where several weeks’ worth 
> of messages have been hanging out!
>
> It might be worth checking with someone who already has their gauges 
> calibrated and comparing readings. I would hope the new car dealers 
> service department would actually calibrate gauges used on customer 
> cars, but would ask to be sure. It also occurs to me that last time I 
> moved the movers damaged my air compressor, and the insurance company 
> has a local company that repairs them. I wonder if they have 
> calibrated gauges, and if one could compare readings with theirs…
>
> -----------------------------------
>
> All the best,
>
> Al Fuller
>
> *From:*Shop-talk <shop-talk-bounces at autox.team.net> *On Behalf Of 
> *Jeff Scarbrough
> *Sent:* Sunday, April 7, 2024 1:13 PM
> *To:* Benjamin Zwissler <bjzwissler at gmail.com>
> *Cc:* Shop-talk at autox.team.net
> *Subject:* Re: [Shop-talk] Tire Gauges
>
> I know that one foot of water column equals 0.433 psi.  So about 70 
> feet of 2" pipe attached to the side of a tall building with a thin 
> diaphragm over a chamber with a Schrader valve should get you close.  
> Might need to make a manometer out of it, so you'll need more pipe.
>
> It's low cost, but not very practical.  I did have a set of weights 
> and an oil reservoir for calibrating liquid pressure, but liquids are 
> not (for our purposes) compressible and air is.  So I don't know how 
> accurate that might be.
>
> If you had some mercury, a 5 foot column should do the trick.  Don't 
> tell the EPD, though.
>
> On Sun, Apr 7, 2024, 15:37 Benjamin Zwissler <bjzwissler at gmail.com> wrote:
>
>     I calibrate my Milton (which has consistently read high) to my
>     wife's tpms value.  Partly because I assume the car is right and
>     partly because I don't like it when she's telling me a week later
>     that she's getting low pressure lights again.
>
>     I don't know how to create an inexpensive standard for
>     calibration.   The Milton is the most expensive gauge I have and
>     has been the least accurate. I looked it up on line and found lots
>     of similar complaints about its inaccuracy.
>
>     Any ideas on creating a low cost pressure standard for calibration?
>
>     Ben
>
>     On Sun, Apr 7, 2024, 1:49 PM Jeff Scarbrough <fishplate at gmail.com>
>     wrote:
>
>         So, I have three tire gauges:  Accutire electronic, Jayco
>         mechanical, and Milton Inflator hose with gauge.  All three
>         report consistently, and all three are 3-4 psi different - low
>         to high in the above order.
>
>         Is there a simple way to check accuracy?
>
>             Jeff
>
>
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