Looks like an easy install to me. Do you want to use this in place of the start function of the ignition key or as an auxiliary start function?
If this will replace the key function, this is the way I would do it:
1.Locate the wire from ignition switch that goes to the starter solenoid and remove it.
2. connect the wire to the new switch.
3. run a 12 volt feed wire to the new switch from the ignition switch, making sure that the source is keyed(meaning it only has 12 volts when key is on)
4. mount the new switch where it will not be bumped. This is also a cheap "anti theft devise" if concealed in a non-visable location, such as up under the dash,under seat, etc, but might be a pain in the butt after awhile.
One thing to keep in mind is that the switch should still be wired in with the neutral safety switch.Nobody wants to see a pic of your car halfway through the back garage wall
