This product comes with 2 pressure sensors. You don't get a chance to test them, and you won't even think to check until you've finished installing the hardware. One of the pressure sensors is defective and does not indicate the correct pressure. There are no calibration instructions, I can send everything back but assemble, cut hoses and run cables. I contact the company and find out about calibration or purchasing a new sensor. However, I've priced the sensors at over $90 so hopefully I won't have to buy them. I will update this review if the situation changes, but for now I am very dissatisfied with this product. The sensor I'm referring to is off at 12 pounds when it says it's 5 pounds, which is the minimum amount of air you should be holding in airbags. When you reach 75 pounds, you will lose 3 pounds. If your blood pressure is normally between 50 and 100, it should be accurate. Going down, the difference between actual and displayed value for a single gauge varies widely by as much as 12lbs. I suggest you also install manual pump valves, which are not included, in case the pump fails. I don't think the hose is included either.
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