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Simple Immobilizer needed

Electrical

Vehicle Information: Model: 911 SC; Year: 1978; Body Type: Coupe; Total Mileage: 127k;

I have recently completed a very expensive total restoration. My insurance will not cover the replacement value of my car, so I 'd like to incorporate a tricky drive-away blocking switch to discourage joy rides/theft.I would like to use an on/off switch at an inconspicuous location (f. ex. use one of the spare toggle switches next to the speedometer.) Question: I would like to wire up this switch so that the car cannot be started; but, rather than use an igintion interrupt (can be easily hotwired) I'd like to use an intercept for the fule delivery , possibly at the fuel pump relay. However, as this is one of those rare relays which does not carry a (low current) control voltage to activate the solenoid, but always carries current large enough to require a very beefy cable to a (low-current) toggle switch, what else can I do to elegantly disrupt fuel delivery, short of removing the whole relay every time I park?Any suggestions are welcome!Kind regards,GM

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