Where is the speed sensor wire 03 F150

I've seen numerous replies from other post just stating "firewall wire harness, inside, driver side, gray/blk"

If someone could please explain to me exactly where or what size wire it is id greatly appreciate it.

In the main harness coming in from that side, there are TWO gray/black wires in that harness, both very small compared to the rest of the bundle, and the one I did try to hook into doesnt work. Just wanna make sure I'm getting the right place before I try and butcher up the other one.

I finally found that also from a full pinout of the 104 connecter/PCM. Same thing, shows pins 58 and 68.

I'm trying to keep everything in the cab for a bit cleaner install. What about the 2 harnesses for the instrument cluster? Anyone have a pin-out of those. I'm thinking if I can tap into the signal that moves the speedo from behind there, I can keep everything hidden up in the dash with no extra wiring visible under the hood and stuff.

1 Last thing also, if maybe anyone can make a guess...... I'm trying to install a Harman Kardon traffic pro nav unit. Everything is connected now except for the speed sensor wire which isnt working at this point like I mentioned. Is it possible that the reverse signal wire works in conjunction with the speed sensor wire, as in one wont work right without the other? Reason I ask is the reverse wire is good all the way to the harness, but the unit so far thinks the truck is always in reverse. Specs in the manual calls for +12 to +16 VDC while in reverse and 0VDC when not in reverse which is obvious. With the harness removed from the back of the unit, the pin does in fact get 12VDC in reverse and nothing in any other gear on the multimeter. I don't  know why the receiver insists it is in reverse all the time unless it needs signal from the speed sensor also to help trigger the change.