If your truck is equipped with a manual transmission, one alternative location for routing the wires and tubing is through this grommet. This grommet is used for A/T trucker and they route the shift cable through this location. Remove the grommet and carefully cut a small hole in it's center with a utility knife. You want to keep the hole slightly smaller than your bundle of wires and tubing. If done correctly the rubber grommet will be tight enough and seal the entry. Don't worry if you make the hole too large.  Simply seal it when you're done with some RTV silicone.
NOTE: You must be certain that any wiring does not come in contact with any of the pedals or steering column shaft. Before deciding on any location to use, check all moving parts first to see where they normally operate.