FXD Super Glide Tacho won’t work

My problem: The speedometer of my 2004 Super Glide (FXD; FD1) just doesn’t show anything; neither the speed, nor the speed/day-kilometre level and also not the “error codes”. 🙁 The turn signals pull in again alone and the engine remains stable even in idle. Now to what I already did: – Tacho sent to the expert, came back as absolutely iO – Sensor cable When I disassembled the thickness on the WE, I saw the rear/bottom/left side of the frame – where the three ground cables are attached – that a ground cable is attached to the frame, but after about 5cm without any counterpart. The loose end looks as if it had gone off from a thin PIN. So fuse box out, all the plug backsides check if it is out of there somewhere (the length of the loose ground cable lays off). e the assumption that it could be from this area). RECENT! Also in the nourishing environment there was no counterpart! Everything was built together again, all fuses checked again for passage, cleaned, contact spray on it and again assembled. Unfortunately the tacho remained out. At the top of the tacho connector the currents measured (orange and brown/grey cable) and it were with running motor clean 14,4 – 14,6V. The passing measurements on the plug of the tacho and the tachos resulted Does any of you have the igniting idea or THE TIP for me, which I could still do without throwing the friendly horrifying money in the throat? Rejoice me on your lively answers!!!