Help wiring fuel pump cut off switch...

I have a 93 LX 5.0 hatch. I want to wire in a cut off switch to the fuel pump relay. I bought a 30amp switch which has three prongs. Is this switch rated at 30amps, too high or too low for the power that will run through it. Also, do I ground it or just run both hot wires to the different sides of the switch? Should I just get a two prong switch????? I park my beast in the city and dont want it stolen! Help!

I dont want any electrical fires...

Ran a two way switch with three prongs. Hid it under the dash. It is awesome! Only cost $5.00! Cheapest anti-theft system ever. I am considering disabling the ignition too.....