Installing an immobiliser on a diesel

A neat way with the 2h motor is to fit a secret switch that mimics the EDIC motor off setting. I also fitted a flashing red LED in the dash that came on when this switch was engaged.
In addition, another secret switch that disables the power to the starter solenoid. The starter relay still would click when the ignition key is turned but the starter itself never comes on - fooled many mechanics with that one.
To stop the bastards getting into your car with the packing tape trick, fit (pop rivet) narrow ss strips bent like this _|-|_ over the pull knobs on the door. If you make them so that the top of the strip is just above the pulled up knob and the vertical sides are quite close it is impossible to loop the tape over the knob through the door rubber gap.
Mind you, the RAC won't be able to open the troopie either if you lock you keys in so hide a spare in a magnetic box at some clever place under the car.
Klaus