Recommendations:

If I was building this again I would do the following:
1. Install a fuse at the trailer socket connections for the brakelight and the taillight and power feed(brown wire).
2. Decrease some of the lengths.  These dimensions are more than ample and the excess slack looks sloppy.
3. Find a different set of magnetically attached lights that are better suited to the rear of the jeep.  As an alternative, I might use some small bungee cords to reinforce the attachment to the bumperettes.  The magnets seem a bit weak.
 

Some hints and instructions:
 

Installing the trailer plug pigtail

1. carefully cut away about 1.5 inches of the outer insulation of the U-Haul wire at the position desired for the pigtail (see dimensions) - be very careful NOT to cut any of the 4 inner wires!
2. cut the white wire in the center of this opening. remove a little insulation from both ends of the white wire
3.  strip 1/2 inch of insulation away fron the center of the brown wire without cutting it
4. solder and tape the trailer plug pigtail wires as shown in the wiring diagram  check your socket to be sure you know which connection is which (ground, stop and tail) use a tester and double check this!

Installing the flasher socket and signal switch

1. cut the U-Haul wire to the desired length to reach the top of the steering tube under the dash (see dimensions) remove 3 inches of the outer insulation and a little insulation from each wire.
2. look at the flasher and socket.  The flasher terminals are marked "P" (pilot), "L" (load), and "X" (power).  identify each one of these on the socket
3.  solder and tape  each connection as shown on the wiring diagram.  the red and green wire are for the front turn signals and are not used (by me, you could use them if required)
4. carefully open the signal-stat 900 switch and remove the pilot light clip assembly (see instructions provided with the switch)
5. remove the 12 volt bulb that came with the switch and solder the ground wire and clip assembly from the waste end of the U-Haul wire to the side of the pilot light clip.  This is to provide a ground for this pilot light without having to "scrape away" some paint from the steering column as directed in the Signal-Stat 900 instructions
6. reinstall the pilot light clip with the #51 (6volt) bulb installed
7.  feed the white ground wire with the clip on the end of it out throught the switch assembly and into the loom provided.  allow it to exit the loom where the flasher is attached (see picture)
8.  use electrical tape to cover all exposed areas of the harness.  Refer to the pictures to see the configuration.
9. use the Signal-Stat 900 attaching clips that are provided but substitute the avaition type hose clamp for the metal strap (see column clamp picture)

Installation of the assembly on the vehicle

1.  Starting at the front I pass the Signal-Stat 900 switch, from left to right, over the top of the steering tube under the dash and attach it to the column  as shown in the picture.  The flasher is taped into the harness and ends up resting on the top of the steering tube under the dash.
2. I wrap the small white ground wire around the tube a couple times to hold the flasher and I attach the clip to the threaded end to one of the bolts that hold my steering tube clamp.  This is my source of ground for the pilot lamp.  The U-Haul supplied clip is perfect for this!
3.  I then pass the U-Haul wire over to the extinguiser and down between the extinguisher and the cowl support pillar, acroos the flor then between the fuel tank and the ouside of the jeep (behind the axe and shovel groove) and under the hip pad. I tuck the slack in behind the fuel tank out of sight.
4.  The wire then follows along the top of the left rear wheel house and exits the rear of the vehicle as shown in the pictures.
5. I loop both lights and plug down through the left rear bumperette once or twice.  This is in case the lights detatch and snag on something they will end up pulling on the bumperette instead of on the signal-stat 900 switch attached to the steering tube!
6.  The plug is inserted into the socket and the lights are stuck to the side of each bumperette as shown, with the wire between them going up over the spare tire carrier to use up slack.  The magnetic "grab" on the bumperettes seems weak, but I have tested this set up over many Maine frost heaves and it has held (see "recommendations" above)

Operation  IMPORTANT!

The assembly gets power to operate the signals fom the tail light feed, so the tail lights MUST BE ON for this thing to work!  If you want to leave the vehicle wiring stock, you must drive with your service lights ON at all times.
If you want to use this assembly with the headlights off you need to move the trailer socket taillight feed wire from the push-pull light switch to the switched side of your ingition switch.  This will cause the tail lights on the assembly or any trailer you tow to be ON continuously when the jeep is on. But, when you shut-off the jeep everything is off.  This wiring change applies to early vehicles with a trailer socket added as a field modification.  If you have a later vehicle with integral trailer socket wiring, I think it still applies, but you should test your vehicle's wiring FIRST to be sure.