I would think the entir fuel system and air box could be monitored. I would also think that one would not change these filters unless they needed it. It wouldn't take to many air filters to pay for the monitor as far as the fuel vacuum maybe a trucker around here knows about that.

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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"