I went with the Valentine 1 design for the directional input. I did my installation a lot different than everyone else.
(1) The head unit (with antennae) goes in the usual place to the left of the rearview mirror. The line to it is inserted in the window trim (I would put a half hitch in it periodically to help it stay in the slot between the interior trim and the glass) and I routed it on the passenger side windshield and to the A post, through the dashboard end trim and down into the footwell area just beneath the carpet trim (out of sight) and then to the center console.
(2) The remote display unit and remote power control unit are mounted inside the little cubbyhole area of the 997 autos beneath the PCM display.
(3) Power to the hard install device was obtained from a switched 12V line above the fuse box (I removed the trim from around the fuse box and loosened up the box considerably to gain good access during the installation). I used the old trial and error method with a multimeter and a pin to probe and ultimately locate a decent switched 12V power source. I grounded the unit with the nut that secures the fuse box assembly to the body.
(4) The power lines are then routed around the left foot well (just below the top of the carpeted areas,--and below the steering rod) to the center console area.
(5) The biggest challenge was fishing the wires into the cubbyhole area. First off, remove the rubber piece that is in the bottom of that area. It is secured in 5 place,--3 along the front lip, and two in the rear. Along with the securing holes are two slightly larger holes in the rear, about a third of the way up from the bottom plate level. Suggest you fish a stiff wire through there toward the front of the car and once through, attach your two power lines (neg and plus) along with the telephone line--2 pair) and taping them to your snake, pull the whole mess into the cubbyhole. For the control line you need to cut off the end (the RJ11 terminal) from the telephone line to get it through the small hole,--note the polarity of the lines,--is the black wire on the left or right?) and using an RJ11 crimper, replace that terminal with the correct polarization once the wire is through.
(5) Build yourself two short telephone lines with RJ11 connectors (properly polarized at each end) crimped on.
(6) Connect everything as needed. I used solder to connect up to the Valentine 1 provided power plug,--shortened to save on excessive wires in there. I also used shrink tubing on both connections. Using double stick foam-back squares, take the two remote units and stick them together, with the display remote on the left side. Using a black magic marker, color in the front seam of the foam so it is hidden from view. Place about 4 more squares of that double stick foam on the top of the remote units (now treat as an assembly). The rubber base for the cubbyhole should have a good sized hole cut out in the rear, left corresponding to where the lines enter the cubbyhole. Using a razerblade, slice a direct slash in it to speed up installation it you choose (or fish everything through first and put the connector (RJ11) on last). Secure the rubber base first. Finally, take the assembly of remotes and press them into the opening, recessing them far enough so that they can be hidden with an optional piece of trim, or what have you for stealth operation.
All done!
Two pictures provided to the way it looks installed: