Theft alarm for portable generator?

[Curmudgeon <ehtoya@xxxxxxxxx>]

I have a Concord Express home alarm system monitored by Vector
Security. They have so far been unable to help me with my question:

I have purchased an expensive portable generator to provide power
during our frequent outages. The generator is stored in my garage, but
must be wheeled outside to the driveway when it is in use. I would
like to devise some sort of sensor that would trigger the alarm system
if the security cable is cut or the sensor is disturbed. Can you
suggest anything that might work? The generator will be run under
cover, protected from rain/snow but open on the sides for ventilation.
As an additional deterrent the generator will also be chained to a
sturdy anchor system buried 36=94 in the ground.