kmb1966 wrote:
We have the Tireminder TM66 on our Class A. We are finding that many times the sensors have a different reading than the manual tire pressure gauge. not a huge difference but enough to not know whether or not to adjust the pressure.
For example this morning our inner dual driver side read 89 on the TPMS. The manual gauge read 96psi.
So I grabbed another manual gauge and it read 96psi. Added 2 psi to the tire and both manual gauges read 98 psi, the Tireminder TPMS reads 91 psi.
Is this an acceptable variance??
ON EDIT:
I forgot to add that one of the 2 manual gauges is a TireMinder brand gauge, just like the TPMS is a TireMinder.
My TM66 reads about 5% higher than my $10 auto store tire gauge. I set my tires to 105 cold using the manual gauge, and each sensor will report between 109 and 112. I am not concerned about this difference, and, as they say, am "fat, dumb, and happy" as long as I don't get an alarm.
I have had two alarms, both of which were false and occurred shortly after pulling into a rest stop. I was told that this can happen if the tires cool down very rapidly causing a quick drop in pressure - even though the pressure doesn't go below the alarm set point.
