Air pressure- Toyota app vs mechanical

Just curious if anyone has compared the tire air pressure from the Toyota app vs say an old fashion mechanical one similar to this one?

Were the tire pressures the same?

I’m going to have to break mine out and test it

just curious

 

The app is just showing what the TPMS sensors last reported. You will be testing against it. Mine tested just like the industry; within one or two psi.

 

Usually 2psi difference.

 

I always use my gauge.

While my TPMS does not report like new models (and I don't care) on either of my Toyotas, the only time the light has appeared was with a rapid temp drop overnight or when there was a screw in a tire.

Otherwise I just check them every couple of weeks as I have since back before such things existed.

I will say that a quality gauge is pricey, but a good investment. I got mine during my soloII days and it still works great.

 

TPMS is great for tracking slow leaks early which hopefully prompts subsequent user investigation.

 

Segal’s Law - he who has one clock always know the time, he who has two clocks is never sure.

Personally I’d put more faith in digital TPMS sensors than an inexpensive wide range mechanical gauge.

Though the TPMS on my 3rd gen is always within 1 psi of the digital gauge on my ryobi inflator, so it’s all good.

 

I've checked mine cold with a decent mechanical gauge, then checked TPMS shortly after driving off. Seems pretty close to me, probably +/- 1 PSI. I've never had a car with TPMS where I felt they were wildly off. Even my 2011 Corvette's TPMS is still dead nuts on vs mechanical gauge.

 

Why are your tires at 42+psi?

 

I used a dial gauge for years. The I got a new inflator and the 2024 with the independent tire pressure read-out and had 4 different pressures (have 2 inflators).
Bought a new "certified" dial gauge and it matched my years-old dial gauge so that's what I use. Dash readout shows 28 psi when I have the tires inflated to 30.

 

As the vehicle cools off, the manually measured tire pressures will begin to lower, but the app is displaying last known pressure, as the tpms only transmits pressures when vehicle is in motion, and after several minutes of inactivity the tpms will "go to sleep"

So, don't misconstrue cooling wheels with erroneous tpms readings.

BTW, the tpms in our Toyota and Nissan seem to be dead on to a quality gauge

 

I got this gauge at Harbor Freight after reading reviews on it. The TPMS is the same as what the gauge says, so I just check the app on my phone once a week and see if there's any variation.

 

Filled mine up at a tire shop that you can set the desired psi and inflate. I set mine at 32 psi all around and my TPMs has been reading it accurately when cold. So my thoughts is a mechanical psi reader should be identical to the TPMs reading.