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Rail Pressure Gauge Wiring??

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Trying to install my rail pressure gauge and having trouble with one wire. They want one wire to tap into a hot lead that is only hot (12v, not dimmed) when the headlights are on. (For running the gauge light). I cannot for the life of me find a wire that is activated this way. Any suggestions?? Thanks!
 
It's on the head light switch, but I don't remember which one. Do a search and you should be about to find it. That's how I found out.
 
Just for future reference on a 2004. 5 you should tap the orange wire with brown stripe. (pin#2)

Double check with a test light to be sure.
 
Thanks Parks! Appreciate the help! Just tapped into that line with all of my gauges (4 extra in all). Just hope it doesn't take out my dimmer switch. Had a problem with my 90 Ford and extra lights run through the headlight switch, however, I was running 22 bulbs on clearance lights. :) Finally did the right thing and ran a separate line for them.
 
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