it looks like it should be dead easy and there's even a predrilled hole for the LED.
but... ive just tried to do mine, taking the red wire from the chip to where the yellow was on the motor, and the black to the green (Having unsoldered the originals). That seems to be the only electrical work needed from the instructions...
my result in the track was a small pop, a slight burning smell and I think something on the chip has burnt out. Resoldered the originals and all is fine again in analogue mode...
have I missed something?