Dimmer Switch Wire?

[grayguy]

Ok, I'm trying to hook up my AutoMeter's so they come on/dim with the rest of the dash, so which wire do I need to hook into coming out of the Column? I could probably figure it out if I had a test light, but I don't, so if someone could clue me in, that would be great.

[phi11]

?white/yellow? off of any switch, like the fog switch?

its the typical interior lighting system, w/ combination meter.

but thats just my guess.