Made a quick scan of forums and couldn’t locate this...TM consistently reads 2-3 psi below a known accurate and calibrated. gauge. Is this well-known and just look for major variances for any issues?
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Our TST runs 2 psi low on the display. 63 psi is actually 65 psi on the gauge. I've gotten used to it and just deal with it.
Aha, I’m not crazy (well at least on this matter). Thanks for confirming.
If you have/take a half-dozen gauges and test them against each other how do you know WHICH if ANY of them are truly accurate? You don’t. Without a recent standardized calibration they’re only representative. I am not so much interested in accuracy (within reason) but precision.
The TST TPMS on our old 1575 consistently showed 5 to 7 PSI lower with the three gauges I had. However, the gauges and TPMS were always consistent.
The on-board TPMS on my new dually totally sucks, however, it sucks consistently. After filling the six tires to 80 psi cold (using one gauge) the on-board TPMS will show the six tires varying from 73 to 78 psi. After the tires warm up in a few tens of miles the TPMS will stabilize at, say, 88 psi for all six (weird I know). After driving the rig for 8K miles, like Randy said above, I’m comfortable with what I know about my tire pressusres.
Dave
Agree, want to simply know the variance and it appears it is -3PSI roughly. Being it was new to me, wanted to be confident knowing it was a calibration issue. That said, I also wanted to know I had 65psi cold in Trailer tires. I pressure tested at a tire shop-I’d think they had accurate equipment-and it was same as my $10 handheld which both were 2-3 psi below the TireMinder. If one didn’t need a wrench to get the TM valves on-off locked down, it’d be a bit simpler. Thank you.
-Dave
Agree, around 3 psi lower on our Minder. As mentioned you become accustomed to it. None the less the Tire Minder system has saved our bacon more than once.
Worth mentioning...... be sure you secure/tighten the sensor down after adding air. If not tight enough the valve stem will leak air.
We really like our Tireminders. We would not want to roll out without them.
Though for some reason position 1 seems to need to be pulled, battery removed and reinserted and then reinstalled at initial start up. It always drops 1# of pressure when taken off and reinstalled, after all my hard work to get them all equal and I see that the entire trip. 
I remove and store them in a multi-compartment pill box when not in use with batteries removed.
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2-3 is fine, when it says 10-15 low, then it's time to worry!! Like my dad always said, "Don't sweat the small change!!"
Bob