Just a quick question.

Clocks from the Full Kit from Luego and this includes a small Hall Effect Speedo sensor with two magnets.

we also have an MT75 with speedsensor so im wondering, is it possible to use this?

I did exactly that, wire the two wires from the speedo to the sensor on the g/box, the third one off the box is an earth, i cant remember which one goes to which now so just twist them together and see if it works. Once working ring up the company that made the dials (ETB in my case) tell them your wheel sizes and they should be able to work out the pulses per minute you need to enter into the speedo so it reads correctly, (mine was only 2 mph over actual speed when tested at SVA), hope this helps, also haynes manual will tell you which wires do what on speedo sensor in the wiring diagram.