So I got around to removing the pesky CARTEK mph converter module (car is now in an EU country using KMH again) and I am left with one wire which I'm not sure where it goes to. It's a gray unmarked wire which seems to have a factory sleeve. It lead directly to the mph converter chip behind the gauge cluster, and it was attached to the "ECU output". Does anybody know where that wire is meant to go to? I'm guessing it comes from the ECU, as I can sort of trace its sleeve going down behind the radio on the right side. Does it usually lead to the other gray wire coming from the speedo plug? I noticed it also had a gray wire, but it didn't appear to be cut anywhere. Here's a few pictures of the mess.

120302571_625141211501753_4587357612324206337_n.jpg120345507_3503720596332835_4960210437350038210_n.jpg120401263_253803039314490_8103948892110796228_n.jpg