One car I had, the oil pressure warning light disabled the electric fuel pump in the tank (unless the starter motor circuit was live). Presumably to turn off the pump in an accident, to prevent petrol being pumped into the engine bay.
Simple to hide a switch that earthed the oil pressure switch.
Embarrassingly, I forgot to switch it back over once and the petrol in the float chamber got me as far as the car park barrier, then the engine cut out just as I started moving forward. Cue me trying to hold up the barrier, whilst trying to push the car far enough forward to prevent the barrier clobbering the roof of the car!
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