Kill Switch

The pink/black should be the 12v constant. The one that runs out of the relay to the inertia switch & pump should be the dark green/yellow one.

Better way follows...

92-93 cars use a different setup & the wire colors are different. The 92 and later cars, the fuel pump relay is under the Mass air duct on the passenger fender well. Cut the red wire going to the fuel pump relay. Splice a 16 or 18 gauge wire into the wire and connect it to one side of the switch. Connect the other side of the switch to the other end of the red wire going to the fuel pump relay. When you are done the switch should be in the middle of the spliced red wire that goes to and comes from the fuel pump relay. Using control side of the circuit allows you to use light gauge wire and light duty switches. There is less than 1 amp going through the circuit, so you don’t have to worry about voltage drop across the wiring depriving the fuel pump of electrical power.
Wiring diagram for 92-93 cars is next