The Rotax engine comes with the two TCU servo plugs attached and two very long lengths of wire from the TCU.( wires 2 and 14 ) I have the wiring from the TCU servo cutout switch ( DPST ) on the panel, through to the engine bay. So I had to connect the TCU servo cutout switch wiring into the Rotax TCU servo loom. I have removed about a 1.5 metres of surplus wire. I tested the continuity through the TCU servo cutout switch from the TCU plug to the TCU servo and all is OK.