The car is an 86 coupe 5.0 car, the previous owner rigged up a kill switch that comes from the tank wiring. The switch controls the fuel pump in the back and the keys does not control the pump only the switch. The fuel gauge needle does not move whatsoever and the low fuel light is activated on the console. How would you guys go about fixing this and bringing it back to stock. With the pump on and when I turn the lights on I can hear the fuel pump slow down as well. Thanks guys