Do you have tires on your tractor that are filled with liquid? This is the product you need. It seems to read correctly. You still need to minimize liquid injection by adjusting the stem around 12:00, but pouring some liquid into it won't destroy that sensor. The only annoyance is that the pressure gauge is spring loaded so you have to read the pressure with a gauge on the rod or it will go back to 0. No big deal. solid product.
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