HELP...Boost gauge issues.

hook up the power wire to the butt connector and
Plug it into your radio fuse spot.

Thats how i wired all of my gauges, works great!
What is the ignition switch 12v (+) ? I have 3 wires that need to go to it, so I have to know exactly what it is.
If I have three wires that need to go to this type of source...would that part you posted work for all 3?
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