Not Ranked
If you put door courtesy light switches in, connected to a horn/siren on a timer, that would deter opening doors more than once.
If you put a pressure mat under the carpet (or whatever flooring) and connect it to the above horn setup, you would deter anyone standing in the car more than once.
If you put a pressure mat under the seat upholstery/cover and connect it etc. for anyone sitting in the car.
Dave
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