Is this system compatible with head unit ib89a3apl?

Hello, unfortunately no. This one is https://www.amazon.com/gp/offer-listing/B07T6T9H71/ref=dp_olp_0?ie=UTF8&condition=all

how do you know what valve stems go to which tire, and what happens when your rotate your tires?

The TPMS app has the option to change the sensor position after a rotation process

The frequency of the sensors are proprietary to Xtrons units only. They won't work with any other sensors.

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Item Weight	1.1 pounds
Item model number	TPMS08
Is Discontinued By Manufacturer	No
Wireless Remote	No