I previously installed the parking brake option. I fashioned a plate out out .064 aluminum and 1/16 angle iron and placed rivets on its upper portion. This allows me to secure it to the bottom of the L instrument panel. I then ran the push/pull cable for the parking brake forward to the parking brake which is attached to the firewall. In addition, I ran the two Comm coaxials forward on the right side of the fuselage to the panel. I also ran the GPS antenna coaxial forward to the panel. Now I need to decide which sites these attach to.