Rail Pressure Gauge Wiring??

[MScheiper]

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!

 

[Tinman]

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.

 

[MScheiper]

Thanks, After much testing, I found it. Thanks again!

 

[Parks]

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.

 

[MScheiper]

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.