A vehicle tracking system includes a wheel unit containing circuitry capable of sensing {HEAD ~ various types} of {TAIL ~ conditions}, such as specific electromagnetic and magnetic signals indicative of particular wheel locations 
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A vehicle tracking system includes a wheel unit containing circuitry capable of sensing { HEAD ~ various types } of { TAIL ~ conditions } , such as specific electromagnetic and magnetic signals indicative of particular wheel locations
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH