TST 507 not very accurate for pressures

[Mark N.]

I have 8 sensors with the system. Each and every one of them read about 5-6 lbs lower than my pressure gauge reads on the same tire. Thinking it must be the gauge, I got the gauges out of each of my other 2 vehicles (yes, I keep one in each car). Ditto. The TST readings were 5-6 psi lower than the gauges (they all agreed with each other, within a lb.) So, today, I take one of the gauges to a local tire dealer to check one more way if my gauges are accurate. Yup, they are right on. So on my truck tire that is actually at a confirmed 60 psi, the TST 507 reads 54. That is a 10% error. That is poor. Each and every one of the 8 sensors read low. With 3 gauges and a tire dealer all confirming the tire pressure, it is obviously the TST 507 that is in error. So now, I better set my low limit alarms to a setting minus 10% for them to be accurate I guess.

[DQDick]

Have you called TST. It's a popular brand and this is the first time I've seen someone with this issues. Mine tend to be plus or minus one pound which I'm fine with.

[mlh]

Sounds more like the base unit. I agree with Dick. Pressure Pro should, will fix it.
Lynwood

[BB_TX]

My TST sensors have pretty well mirrored my gauge also. I would call them and see what they have to say.

[Mr Pachu]

My TST 507 sensors are usually dead on or within one pound of my gauge.

[richfaa]

My 507 TST is the same way they read low by 4 to 5 PSI I was planning to call TST Tomorrow.I am not happy with the TST system.

[mhs4771]

Well I have the Tire Trackker system and the sensors are off too, but as long as I've set the pressure with a guage I just use the system to let me know of any sudden changes.

[richfaa]

If you read the manual you will find that the PSI is less accurate as the set tire PSI goes up. There is less error at 80PSI than 110PSI and I have found that to be true. Out Pressure pro system was much more accurate.

[RKassl]

Our Pressure Pro system has always been with 1-2 pounds at the most different from the manual tire gauge. Have ha this same system for both of our Montana's just purchased new sensors last year.

[Bill.vannuys]

I just installed my TST 507 non Flow-thru sensors recently purchased today. Having read this first, I was skeptical and proceeded to check several sensors on the same tire several times. The pressure reading for each sensor matched exactly and was the same as my gauge reading at 98 PSI. My system is working well. Perhaps just lucky.

I had several digital gauges previously that gave a variety of readings - always different than the last reading or the other gauge reading. Finally I recycled them in the land fill and bought my current non-digital gauge that gives reproducible readings.

I found the TST customer service very helpful when I ordered and surely they will fix the problem. Good luck.

[Irlpguy]

I have no complaint with the accuracy of my TST system, I do not have flow through sensors which should not make any difference to their accuracy.
I have used two different analog gauges and there is always a minor discrepancy between them, however the TST reading is within a lb or two of the gauges and accurate enough in my opinion.
I second the TST customer service, they are very good and accessible.

[richfaa]

We set the tire pressure at 110 we have two quality digital tire gauges. We then record the PSI at the monitor in the truck and that is the official reading. It will read about 105 so 105 is 110.

[Mark N.]

I just took my digital gauge to yet another tire dealer to have it checked. It is indeed spot on. So, the 507's are indeed reading 10% low, across all 8 of them. I sent an e-mail to the company last Friday explaining the problem and the steps I have taken to verify the problem. As of yet, no response.
So now, I guess I better adjust my low-limit alarms by the 10% error too. I don't care about the high-limit alarm. I see them as pointless. The air pressure in a tire can't reach dangerous levels on it's own. No matter what happens inside the hub. The temperature alarm is nice though, in case of a bearing issue.

[richfaa]

Sounds like I have the same problem as you with the 507 TST Mark. I have not called TST yet.

[Dmcgrew]

I have the TST 507 with flow through sensors. They are within 1 psi of the gauge. Love the system!

[Justme44]

I installed 510's last week. I have 80 pounds in all 4 tires. At 40 degrees the 510's read 69, 70, 72 and 73. After 20 miles they read 75, 76, 73 and 77. This is not good. In addition the display unit beeps as it tests each tire. This is driving my wife nuts. I don't want to know I have this device until there is a problem. I now have the tires set at 70. 80 pounds is the correct pressure. I am going to call TST.

[bshgto]

Mine have always read 4 to 5 lbs low from gage, new gage different set of numbers but always low so I just keep that in mind.

[rohrmann]

Justme44, you need to maintain 80 PSI COLD. Your tires will always increase pressure as you roll down the road, as your temperature will increase also. This is normal, and by lowering the cold pressure, you are lowering the weight carrying capacity of those tires, which will increase the odds of an early failure.

[chris199]

Richfaa

What was the result of your call to TST?

[Mark N.]

quote:Originally posted by chris199

Richfaa

What was the result of your call to TST?

They suggested I tighten the sensors another half-to a full turn. Sorry, but when I install them, I install them tight. There isn't another half-to-full turn left in them!