Moved to ”Interior Mods & Upgrades Chat”...
Did you get a narrow band or wide band gauge?

Check this:
http://www.focusfanatics.com/forum/showthread.php?s=&threadid=89904

 

i dont kno what wire to wire it to but i kno there are holes in the firewall you can get it through just got to find it.....dont kno if that helps

 

Actually, there is a spot where you can go through the firewall with a small guage wire. You can feed the wire through the grommet through which your hood latch release cable goes. It's a real pain to do, but it can be done, I ran a single 16ga. wire through this grommet. The rubber grommet will also protect from any chaffing of the wire. Just an idea.

 

i found a hole in the firewall big enough to run my power wire from my amp to my battery...it was located up behind one of the pedals on the driver side you just have to pull up the carpet and look around for it...if worse comes to worse i can e-mail you a pic of where the hole is so you can find it easier....