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Actually the Arsenal errata is going to fix it up.
Supposedly.
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The rule I would use, which approximates how the errata will do it, is: every type of sensor has a rating from 1-6. The cost for sensors that don't have a rating in the book is base cost x rating. If you upgrade all the sensors in a vehicle's sensor package to a certain rating, then the vehicle's sensor rating will be raised to that rating.
Someone check me on this, but don't the higher ratings of Sensors include more devices? So something with more devices should have an equal or better Sensor rating than one with fewer, higher-powered devices?