Turbo II - Absolutely the correct answers. I don't think previous posts clearified that. I am using two kill switches, one behind the driver and the other one on the back of the car. Just tied them in series and run my hot wire to the ignition module and fuel pump from the switch behind the driver.
If you tie the switch to the ground side, as I have by personal experience seen, in a bad flipover, fuel pumps still running even with the switch turned off! Seems that they can still make ground or negitive contact. Worse yet , other components will make ground through this point and still run. If we are talking fuel pump, we are talking instant overload and fire here!
cobrashock