Go Back   iRV2 Forums > iRV2.com COMMUNITY FORUMS > iRV2.com General Discussion
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
Thread Tools Search this Thread Display Modes
Old 09-23-2016, 09:10 PM   #1
jimws's Avatar
Join Date: Feb 2012
Posts: 55
TST Monitor vs Digital Gauge Pressure

I have the TST 507 monitor system for my 5er & truck. I also have 2 good digital tire pressure gauges.

The 2 digital pressure gauges read within 1/2 # of each other. The TST system consistently reads 3 to 4 # lower, depending upon the tire, than the 2 gauges.

1- Anyone else experience this?
2- Which do you trust?

jimws is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 09-23-2016, 09:24 PM   #2
Community Administrator
JohnRR's Avatar

Fleetwood Owners Club
Workhorse Chassis Owner
Join Date: Sep 2010
Location: Marquette, Michigan "Da UP"
Posts: 14,877
Im not looking for precise accuracy with the TPMS just compatible readings while driving. You can't check what's happening while your driving even with the best most accurate pressure gauge.

John & Cathy R.
06 Pace Arrow 38L W24
08 Lincoln MKX AWD
See My RV Upgrades
JohnRR is offline   Reply With Quote
Old 09-24-2016, 04:25 AM   #3
Senior Member
dabrooks's Avatar
Tiffin Owners Club
Join Date: Sep 2012
Location: Maryland
Posts: 801
My TST 507 system reads within 1lbs of my gauge. But John is right. I watching the pressures as I am driving to insure they stay consistent with each other. I do check the TST every morning before I start out but I know they read 1lb low so there is no issue with me. At 1lb or 4lbs there wouldn't be an issue any way as long as you know the difference.
dabrooks is offline   Reply With Quote
Old 09-24-2016, 04:33 AM   #4
Senior Member
Dr4Film's Avatar

Monaco Owners Club
Join Date: Oct 2009
Location: Varies Depending on The Weather
Posts: 7,563
Any TPMS regardless of brand will generally not be as accurate as your calibrated tire psi gauge PLUS it doesn't have to be. The sole purpose of a TPMS is warn you of a slow leak so you have time to correct the problem.

If not running with a TPMS and you do have a slow leak you WILL destroy the tire and possibly much more once the tire self destructs from heat.

Dr4Film ----- Richard
2002 Monaco Windsor PBT 40Ft. (R HOME) - 30Ft. 2006 Pace Trailer (R JUNK). Trailer Has 06 VUE (R TOWD) 04 Victory Alen Ness Edition (R RYDE). Full-Timer for 14 Yr's BUT now a Part-Timer. Cummins ISC-350 With Banks Power Pack and Upgraded PRXB PacBrake.
Winter Home in Flagler Beach FL - Now Staying in Dansville NY for the Summer.
Dr4Film is offline   Reply With Quote
Old 09-24-2016, 04:35 AM   #5
Senior Member
Chuck_Hammer's Avatar
Join Date: Jul 2015
Location: Upper Right Ohio.. or?
Posts: 276
if available, calibrated would be very pricy... and NOT needed.

just make a note of difference... and monitor for a Change,, NOT value.

looking for air leak,, or heat buildup.
2012 Ford F 250,"XL" 6.2L Gas, 2 wheel drive. 147,000 miles
2005 Coachmen 29FKCS, Front Kitchen... 2005 Honda VTX1800F
N.E. Ohio in the Spring, Summer, Autumn.
Chuck_Hammer is offline   Reply With Quote
Old 09-24-2016, 05:27 AM   #6
Senior Member
Coastal Campers
Join Date: Jun 2011
Location: Hiawassee, Ga.
Posts: 392
There is an old saying, "a man with two watches is never sure what time it is". The same for two tire pressure measurement devices. Just pick one over the other and stay with it for consistency.
Thor Four Winds 22e
nosticks is offline   Reply With Quote
Old 09-24-2016, 05:27 AM   #7
Senior Member
iRV2 No Limits Club
Join Date: Aug 2013
Posts: 122
+1 to all the above. Tpms just tells you about changes. If you try to get it exactly like your accurate gauges you will be chasing air temps the rest of your RV life. (Don't ask me how I know this)
2014 Itasca Sunova 33C
georgelesley is offline   Reply With Quote
Old 09-24-2016, 12:51 PM   #8
Senior Member/RVM #90
MSHappyCampers's Avatar

Monaco Owners Club
Join Date: Nov 2002
Location: Columbus, MS
Posts: 19,300
TPMS and tire pressure gauges serve two entirely different purposes!

I don't worry that the TPMS is not accurate, just that it does it's job when needed!
Joe & Annette

2002 Monaco Windsor 40PBT, 2013 Honda CRV AWD
MSHappyCampers is offline   Reply With Quote
Old 09-24-2016, 01:31 PM   #9
Senior Member
greystroke's Avatar

Monaco Owners Club
Freightliner Owners Club
Holiday Rambler Owners Club
Join Date: Jul 2009
Location: Spring Hill, Florida
Posts: 1,108
Pressure Calibrations are usually performed with Dead Weight Testers (DWT). They have a calibrated cylinder where for a given force on the cylinder produces a given pressure when the cylinder is suspended. To be calibrated the DWT must have traceability to NIST(National institute of Standard Labs) previously known NBS (National Burea of Standards)

To my knowledge the DWT is still the most accurate and repeatable device. At least it was when I performed pressure calibrations years ago. It is accurate and repeatable since it directly uses the formula Pressure = Force/Area.

All that said I use two standard(non-digital) analog pressure gauges and usually split the difference between the two readings. Best I can do without paying for an expensive calibration. I use the analog devices because it more closely uses the Pressure = Force/area concept and although the readings may change over time due to wear, I feel they are my best bet.

Other devices such as pressure sensors or bourdon types have to go through or traceable to a DWT and then on to NIST. The readings can go off if the sensors have malfunctions.

Tire pressures calibration is a waste of time. If there close and don't change much during trip your good to go. I just compare the TST sensor pressures to the avg of two analog gauges. That gets me close.
98 Endeavor DP, ISB275
RX300, Falcon II hitch, BB Vantage Select
VMSpc, 2002 Grey Ford Powerstroke
TST 507 w/ 10 Sensors
greystroke is offline   Reply With Quote
Old 10-02-2016, 09:59 AM   #10
Junior Member
Join Date: Oct 2015
Posts: 24
More probable than than not, somebody is deflating your tires. After measuring air pressure with multiple uncalibrated gauges, that was the conclusion reached by the NFL.

2003 Bounder 32W + 2011 Subaru Forester
bobk3d is offline   Reply With Quote

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
TST versus EEZ RV Products Tire Pressure/Temperature Monitor systems. leeines Gear and Product Discussions 50 11-03-2014 01:29 PM
TST Tire pressure monitor system ajm12 RV Systems & Appliances 9 05-21-2013 02:32 PM
TST Tire Pressure Monitor System RetiredBob Class A Motorhome Discussions 5 07-19-2012 06:28 PM
TST Tire Pressure Monitor Hard Wired ? hardy1000 MH-General Discussions & Problems 10 11-08-2009 01:46 PM

» Virginia Campgrounds

Reviews provided by

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities

Copyright 2002-2015 Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 12:20 PM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.