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05-01-2015, 08:46 AM
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#1
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Senior Member
Join Date: Dec 2014
Location: High up in Arizona
Posts: 2,050
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Tire pressure gauge
We all know it is important to keep tires inflated properly. I have 3 different gauges that are all decent and accurate, I thought. One is digital, one is a pencil style and the other is a larger type. I get 3 different readings that range up to 8lbs. How does anyone really know what pressure they truly have in the tires and what gauges do some of you use?
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2019 Allegro Bus 37AP towing a Jeep JK Rubicon Wrangler
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05-01-2015, 09:44 AM
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#2
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Senior Member
Join Date: Sep 2013
Posts: 1,781
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I have the same problem and the TPMS shows a different number still.
So, I go with the TPMS because I like to see all matching number on the display and if anyone ever challenges that I had my tires inflated correctly, it'll be in the OBD.
I do have one tire gauge that matches the TPMS, but it only goes to 50psi.
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Manny & Larissa
2013 Winnebago 2301BH-Red
2012 Ram 2500 Megacab HO CTD
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05-01-2015, 09:49 AM
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#3
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Senior Member
Winnebago Owners Club Freightliner Owners Club
Join Date: Jun 2013
Location: 5 miles south of Lakeville, Mn
Posts: 3,047
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I have driven over the road since I was fifteen, (sixty years), and let me tell you that you are being way too anal about pressure. Pressures will vary if the sun shines on one side, an exhaust warms a tire, ect. Set them to manufacturers recommended pressure and then just monitor them. If one suddenly is way out of whack check it with a gauge. Otherwise don't fret so much.
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Jim and Carol Cooper with Oreo the Kitty
FAA ATC ret, VFW, AL, VVA, NRA
US Army Aviation, MACV Vietnam 65-66
2012 Journey 36M, Cummings 360hp
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05-01-2015, 10:38 AM
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#4
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Senior Member
Join Date: Sep 2014
Location: Newcastle West, Ireland
Posts: 396
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We should all use a manometer to set the pressures withing 0.1 psi
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'98 Southwind 34L, too many cameras, old hat, young heart.
May the light be with you.
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05-01-2015, 10:38 AM
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#5
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Senior Member
Join Date: Dec 2014
Location: High up in Arizona
Posts: 2,050
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Quote:
Originally Posted by Cooperhawk
Set them to manufacturers recommended pressure and then just monitor them. If one suddenly is way out of whack check it with a gauge. Otherwise don't fret so much.
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Well that is kind of my point here. If one devise says you are at 90psi and another one says you are at 82psi and then another one says you are at 86psi then how do you know which is correct? I understand sun and temperature affects the pressure but you need to start somewhere with a correct reading.
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2019 Allegro Bus 37AP towing a Jeep JK Rubicon Wrangler
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05-01-2015, 12:10 PM
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#6
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Senior Member
Join Date: Jul 2014
Location: Lafayette, La.
Posts: 1,144
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I have 2 of the standard truck type gauges & the one I use to fill tires with has a round 150psi gauge attached to the air hose (all 3 are within 2 lbs. of each other). The TPMS is 1 lb. off so that is close enough for me.
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2011 40' Monaco Cayman PBQ ISC 360
2013 Jeep Wrangler Unlimited
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05-01-2015, 03:12 PM
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#7
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Senior Member
Join Date: Jun 2010
Location: Upstate New York
Posts: 3,722
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Here's a temperature compensating gauge, accurate to 1/10th pound - cheap at $399 (plus shipping of course) : Longacre Temp Compensated Tire Gauge 53050
Use the link and 'drill down' for other Longacre choices, all better then Wally Worlds junkers. I'm currently using a Textron digital which matches my commercial Schrader along with the TPMS on the tow vehicle and the add-on TST system installed on the 5er and look for significant rolling pressure and temp variations on the trailer instead of hair splitting set accuracy.
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Dave W
2011 Ford F250 6.7 Lariat CCLB, Gone but not forgotten
2014 Montana High Country 343RL (sold it!)
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05-01-2015, 03:17 PM
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#8
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Senior Member
Country Coach Owners Club Solo Rvers Club iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 37,725
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I bought a certified gauge at Napa, never use it to check the tires, just to check the other gauges I have.
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2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft, HWH Active Air
Charter Good Sam Lifetime Member, FMCA,
RV'ing since 1957, NRA Benefactor Life, towing '21 Jeep JLU Rubicon Ecodiesel
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05-01-2015, 03:48 PM
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#9
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Senior Member
Fleetwood Owners Club American Coach Owners Club Spartan Chassis
Join Date: Oct 2009
Location: Fort Pierce, FL
Posts: 1,025
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I have three Accutire digital gauges I have bought over the years. They all look different but each one measures within 1 psi of the others. In science, we have accuracy and we have precision. Since we do not know the true pressure, we cannot see how accurate we are. But if all three gauges measure the same, we are precise, and that leads to confidence we are close to the actual value.
Since all my gauges read almost the same, I trust anyone of them. By the way, I originally had a Milton, supposedly the best, it read the same as the Accutires. One day it showed a tire at 115 that was supposed to be 100 psi. I re-measured with an Accutire and saw 100, as I thought it should have been. I called Milton; they don't make their own gauges any more. I bought a rebuild kit for it and it still always reads 15% higher than my others.
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Revolution LE 38X C9 Cat
2020 Jeep Gladiator Toad
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05-01-2015, 07:19 PM
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#10
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Moderator Emeritus
Join Date: Jan 2000
Location: West Palm Beach, FL. USA
Posts: 27,713
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From what I read, outside of laboratory grade instruments the expected accuracy is plus/minus 3%. And you shouldn't expect a gauge that gets knocked around a lot of maintain its accuracy, whatever it may have been initially.
I too have found my Accutire digital gauge to be consistently quite accurate.
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Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
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05-02-2015, 02:36 PM
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#11
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Registered User
Triple E Owners Club Ford Super Duty Owner
Join Date: Apr 2013
Posts: 1,745
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05-02-2015, 06:13 PM
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#12
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Senior Member
Join Date: Dec 2012
Location: Full Timing
Posts: 751
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No one is more unsure of the actual time than a man with two watches.
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Mike
2003 Alpine Coach 40MDTS - 400HP Cummins ISL
Can Am Spyder Roadster
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