Ok, to raise an old thread.
I finally got around to installing my gauge. Where you chose to cut the hose is a total pain in the ass. Especially for me because i really didn't want to move my intercooler cold pipe that runs to the throttle body out of the way. SOOO i was trying to do everything with it still there.
Overall it was a great how to, but alas, my stupidity wins over your great how to. I got clamps that were barely too small, and i had to go down and get new ones (which i haven't done as of now, because its 3 in the morning.
My one question is where did you tap for the ignition?
On the back of my gauge there are 3 posts. The sensor, the ground, and the ignition. Did you not hook the ignition wire up? or did you just use the same 12v source as the light uses?