Anyone know what dash wire is for cluster illumination
 

I knew I should have saved the wiring diagrams before I lost access, but regardless, does anyone know what wire is used for dash cluster illumination? (or any other wire that goes hot when headlights switch on would work too)

i kno illumination wire on my Eclipse head unit is orange

BCM X4-F3 (heated seats..not used)
BCM X4-F2 (boost gage)
BCM X4-B2 (to splice)

Gray wire at pin
D of TCS switch
D of fog light switch
B of hazard
B of boost gage
8 of I/P cluster

I assume the OP asked because of adding a gauge like an interceptor or something. I have an interceptor coming soon and I was wondering the same thing.

So I'd like to use my TCS switch or fog lamp switch because it is closer.. and would switch with my lights. Is that a good idea?

Go you need a wire thats hot with the headlights on or a wire thats hot when the dash lights are on? two seperate things.

Trying to wire a foot well light in, want it to go on when dark, when it goes dark both headlights and dash lights go on, so I figure either would work. Was also contemplating wiring it also with rear mirror lights, but that would require some transistors.

FYI the info i listed is the dimming circuit

Yes, that is good info. I looked in the service manual online and you're right on.