Tracker bars are found with slightly different configurations to
squeeze all the tubes into one space.  The easiest way to keep the new
hoses in order is to use two pipe cleaners.  Dye one red and one green,
using food coloring.

Insert the red pipe cleaner into the first hole, so that it projects
out the back of the nipple.  Connect the hose to the nipple, leaving
the red pipe cleaner in place.  Insert the green pipe cleaner in the
next hole, and connect the next hose.

Alternately move the pipe cleaners as you progress.  Using this method
will keep everything in the correct order.

Bruce Clark