Jon,

The little defroster vent ducting may hinder some tubing going through that location. Second, the ECU mounting area, for those of us with stock trucks also prevents tubing going through the dash in the right side of LHD trucks. Third, the fuse block is in the way of dash penetration of the left side of LHD trucks. Very tight quarters behind the dash for any respectable tubing size. I'll get some photos up, too.

Russell