i'm puting an rb20det from a r32 in a vl calais and have a couple of wires left.. tacho wire (what is involved in getting the originall vl tacho running) neutral switch(is it a negative or positive going to the computer) do we need to wire up the ficd relay???

If there is no plug for the tacho in your rb20 loom just connect it to a coil like you would an aftermarket monster tacho. There is one wire coming from the back of the dash plug that is the tacho wire that should receieve the tacho signal, i think it's blue but i could be wrong.. look in your workshop manual. The neutral switch (if its for the gearbox)is to make sure that you can't start your car in gear. I ****ed up the wiring for my auto one and now the car only starts in 1st and neutral hehe (so dont take my advice) If its the last wire left why not try both combinations of positive and negative, it wont blow anything up.