You need to use a relay because the amp load is too much for most switchs, but with the 25amp fuse you have I THINK you be ok.
All you need to do is splice that switch into the "hot" wire in the fuel pump relay. The wire you want to splice the switch into is Red w/ a Black tracer, and connects your fuel pump relay (under the drivers seat) to the inertia switch.
-Josh, aka the tireburner
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1987 Buick T-type
1998 HD Electra Elide
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