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I had trouble with mine too after I put new tires on
After I disconnected the battery neg cable I waited a few minutes to reinstall
then I let all the air out of the tires to about 10 lbs and reiflated to 30lbs
after that the sensors were working again
I don't know which did the trick but they work now
WTF???????????? Add 30 psi to your tires then use the gage. See if that fixes the issue.
If you cant read the pressure with the pressure gage, one of three things are wrong.
NO pressure
Pressure Gage is bad.
There is something in the stem blocking the small valve needle. (this happened to me once when I installed an after market valve cap. )